BTM51xx Features and Benefits
Contents
1. benefit of upgrading to v1 6 of HFP is that it supports wideband speech WBS WBS uses a 16 kHz audio sampling rate rather than 8 kHz and a modified SBC codec mSBC to compress the voice data for bi directional transmission over a limited bandwidth eSCO link The higher sampling rate leads to a more natural sound of voice Benefits As a result of continuous improvement BTM51x now supports the HFP features Voice recognition activation and remote volume control Voice recognition allows to remotely activate and send voice commands to speech recognition applications on a smartphone e g Siri This feature comes with GPIO support enabling the user to toggle this function by a button from the hands free device Thanks to remote volume control hands free unit s speaker volume and microphone gain can now be controlled by the audio gateway remotely Vice versa the audio gateway is informed whenever a gain change takes place at the hands free unit With new firmware update ringtones are now available and can be used for either ringing purposes on HF or can be triggered at any time using AT commands On top of this users now also benefit from transparent access to the rfcomm link of a HFP or HSP connection SLC ACL Whereas this layer used to be hidden from the user in the past BTM51x now gives you the freedom to send and receive custom commands over SLC or ACL The closely related SLC spy feature allows you to analyse the rfcomm lin2. this effortlessly by supporting Headset Profile HSP for the mono voice telephone and Serial Port Profile SPP for the data channel Similarly a customer required the ability to stream stereo audio for playing music files from their device and a data stream for GPS data implemented by simultaneously using A2DP and SPP Flow Diagrams 1 5 in the Role Switch section outline the various scenarios that are easily addressed within the module s firmware Role Switch Better control on Bluetooth links is achieved by new AT commands allowing to request an HCI role change master slave either manually or automatically on connect This helps to improve Bluetooth performance in particular use cases e g when an A2DP link is initiated from BTM5 to a phone A2DP HSP HFP BTM51x le AVRCP Device A BTM51x Device A SPP SPP Diagram 1 A2DP AVRCP and SPP with one device Diagram 4 HSP HFP and SPP with one device A2DP BTM51x AVRCP HSP HFP SPP Device B BTM51x Diagram 2 A2DP AVRCP and SPP with two devices any combination is possible SPP Device B A2DP Device A JR es Diagram 5 HSP HFP and SPP with two devices AVRCP any combination is possible BTM51x Device B ee Device C Diagram 3 A2DP AVRCP and SPP with three devices Note Some combinations of the HSP HFP configuration may be complex
3. AE network The FAE team is represented by support teams in Asia Europe and the US who will assist customers through the complete product development cycle initial evaluation prototypes pre production and mass production roll out Examples of the supporting documentation can be found in Appendix B with web links to the content F Laird Embedded Wireless Solutions Support 8 Americas 1 800 492 2320 Center http ews support lairdtech com Europe 44 1628 858 940 l Hong Kong 852 2923 0610 www lairdtech com bluetooth BTM5xx Series Features and Benefits Application Note APPENDIX A AT COMMAND EXAMPLE FOR CVC FUNCTIONALITY Prepare AT Command Settings The following AT command sequence needs to be sent to the BTM5xx in order to prepare it for CVC headset 1 mic AT amp F Restore factory default settings ATS102 10 Enable Bluetooth Hands free profile gt Hands free role This does not mean that the CVC hands free image must be used it also works with CVC headset 1 mic image and CVC headset 2 mic image HFP allows creation and closure of a SCO channel at any time from either end therefore it is the most suitable BT profile for the CVC development phase ATS512 4 Make module permanently discoverable and connectable ATS318 1 Select CVC image headset 1 microphone See the section on Clear Voice Capture CVC for more information AT amp W Store settings ATZ Reset module New settings take eff
4. BTM5xx Series FIRMWARE v22 2 5 0 Laird gt FEATURES AND BENEFITS Application Note v1 0 INTRODUCTION This document refers to the following Laird part numbers BTM510 09 Bluetooth Multimedia Module with external antenna BTM511 09 Bluetooth Multimedia Module with integrated antenna DVK BTM510 Development Board with BTM510 soldered in place DVK BTM511 Development Board with BTM511 soldered in place The BTM module family with associated development kits has been available as a mass production part since late 2010 As part of Laird s commitment to continuous improvement and technical innovation the product family has been consistently enhanced to provide key benefits for the global customer base This document provides details and analysis of the enhanced feature set of the BTM51x series of Bluetooth Class 2 Audio modules from Laird as supported by firmware v22 2 5 0 which was made publically available in February 2015 BTM5 Series General Overview The BTM5 series consists of Class 2 Bluetooth modules designed to add robust audio and voice capabilities to OEM products The modules which are based on the market leading Cambridge Silicon Radio CSR BCO5 chipset provide an integrated stereo codec and a 64 MIPS Kalimba DSP Using additional soft codecs designers can add features such as echo cancellation noise reduction and audio enhancement The module range supports Bluetooth specification v3 0 with Simple S
5. aird Revision History 1 0 17 Mar 2015 Initial Release Jonathan Kaye F Laird Embedded Wireless Solutions Support 11 Americas 1 800 492 2320 Center http ews support lairdtech com Europe 44 1628 858 940 f Hong Kong 852 2923 0610 www lairdtech com bluetooth
6. due to the actual role specified For example simultaneously enabling the Gateway plus Headset Hands Free role results in an unresponsive system Enabling both Handsfree Headset unit HF HS and the complementary audio gateway role HFG HSG simultaneously is no longer recommended Please contact your local Laird FAE for further information bedded Wirel luti te Embedded Wireless Solutions Support 4 Americas 1 800 492 2320 Center http ews support lairdtech com Europe 44 1628 858 940 l Hong Kong 852 2923 0610 www lairdtech com bluetooth BTM5xx Series Features and Benefits Application Note AUDIO ENHANCEMENTS Audio Overview In the latest firmware update 12S format is controlled by S register rather than by PSKEY and functions can be tested by the 12S cross loopback mode feature In addition the new firmware allows cross loopback from analogue to 12S or PCM allowing analogue to I2S PCM conversion for enhanced testing In the BTM5xx module analogue audio input stereo is routed to SD_OUT and at the same time SD_IN is routed to analogue audio output stereo I2S cross loopback mode is enabled by AT BTL3 I2S master role or by AT BTL4 I2S slave role Constant Sampling Rate Constant sampling rate is an important feature that applies to both A2DP Sink and SCO audio It is needed if an external hardware codec is used via PCM or I2S interface rather than the on board ADC DAC The resampling algorithm running on the i
7. e SCO link AT HFGH Release HFP Service level connection SLC If SCO link exists it will be released automatically ATH Close all connections of the module This command can be used alternatively to AT HFH Laird Embedded Wireless Solutions Support 10 Americas 1 800 492 2320 Center http ews support lairdtech com Europe 44 1628 858 940 Hong Kong 852 2923 0610 www lairdtech com bluetooth BTM5xx Series Features and Benefits Application Note APPENDIX B EXAMPLES OF THE CURRENT BTM5 SERIES DOCUMENTATION Bluetooth Audio Modules All of the following documents can be accessed from the Laird BTM510 511 Embedded Wireless Support site n Datasheet i A BTM510 511 User Manual Qo 7 Firmware Release Notes BTM510 511 to v22 2 5 0 Development Kit Schematics BTM510 Feature rich BCO5 Class 2 i l module for high quality audio and Development Kit Schematics BTM511 stereo Bluetooth applications BTM511 Development Kit Quick Start A2DP and AVRCP v2 BTM511 Development Kit Quick Start HFP v2 BTM511 Development Kit Quick Start SPP v2 2015 Laird This document is issued by Laird Limited in confidence and is not to be reproduced in whole or in part without the prior written permission of Laird The information contained herein is the property of Laird and is to be used only for the purpose for which it is submitted and is not to be released in whole or in part without the prior written permission of L
8. e s preferred codec for iOS devices AAC technology is IP owned by numerous third parties and requires an independent license for use in the finished OEM product For details please visit http www vialicensing com In summary the BTM5 series supports the following A2DP encoders and decoders Encoders A2DP source role SBC APTX Decoders A2DP sink role SBC APTX AAC Soft codec support in standard production firmware enables customers to seamlessly support the vast majority of codec implementations found in today s electronic devices Simultaneous Profile Support Overview The comprehensive AT command structure implemented on the BTM5 series allows customers the flexibility to support multiple Bluetooth profiles simultaneously Laird s years of experience in embedded Bluetooth applications have helped to illuminate specific customer use case scenarios that can only be realized by supporting simultaneous device profiles f Laird Embedded Wireless Solutions Support 3 Americas 1 800 492 2320 Center http ews support lairdtech com Europe 44 1628 858 940 Hong Kong 852 2923 0610 www lairdtech com bluetooth BTM5xx Series Features and Benefits Application Note Usage Example A customer implementing a Bluetooth wireless solution for first responders needed the ability to have a voice communications to BT enabled gateway cellular device as well as a data stream for sensor data The BTM5 series AT command set handles
9. ect upon reset ATl4 Query module s Bluetooth device address In this example the response should be 00025b00ff01 Will be required to initiate a connection to this device Create an SCO Link For the CVC image to be loaded a SCO link must be created One option is to use a mobile phone as the audio gateway for HFP A better option at least for the development phase is a second BTM5xx e g a BTM51x development kit because this allows full control over the SCO link mobile phones often close the SCO link if no audio is being transmitted This setup is outlined below CVC Example Setup 2 BTMS5xx audio HEG out CVC enabled a SCO link no CVC audio S318 1 audio source e g PC MP3 player microphone Figure 1 CVC example setup The second BTM5xx is configured as follows AT amp F Restore factory default settings ATS102 40 Enable Bluetooth Hands free profile gt audio gateway role ATS512 4 Make module permanently discoverable and connectable AT amp W Store settings ATZ Reset module new settings apply from now onwards ATl4 Query module s Bluetooth device address Will be required if we are going to initiate a connection to this device F Laird Embedded Wireless Solutions Support 9 Americas 1 800 492 2320 Center http ews support lairdtech com Europe 44 1628 858 940 Hong Kong 852 2923 0610 www lairdtech com bluetooth BTM5xx Series Features and Benef
10. ecure Pairing for improved security and easier user functionality The BTM5 series offers significant time and cost advantages over an integrated or on board solution The modules carry a broad range of certifications Bluetooth END product FCC modular MIC IC and CE and support contain an extensive Bluetooth profile suite including support for SPP HFP HSP A2DP and AVRCP Support for a comprehensive AT command interface speeds integration and simplifies application development in the potentially complex world of mono and stereo audio products A low cost feature rich development kit further speeds customer s time to market The following table summarizes the advantages of BTM5 series modules over a Bluetooth chip V Because the module is a complete full x Because a chip requires more planning Device i De Life Cwcl featured component time to market is for integration onto the target circuit rere much shorter board time to market is longer I Requires less integration effort You can x Integration onto the host device s RF Design rely on Laird s expertise for the BT and RF board is more complicated you must and design have your own RF design experts Integration MI Functions with simple and easy to use AT commands S pport M Laird can provide on going support and x Once you integrate a chip onto a PCB PP troubleshooting for the module you own the support responsibility Cost MI Involves the purchase of a
11. etadata virtual folder browsing absolute volume control player applications settings and more The user interface provides users with the ability to control player application settings such as repeat mode and shuffle and indicates current playlists now playing play status change etc Unique to Laird the latest production release of firmware v22 2 5 0 for the BTMS series provides UID cache index which avoids handling of 64 bit UIDs on resource constrained host controller Up to 10 UIDs of a list AT AVQFS are cached when the list is printed For a subsequent command the UID index can be passed 0 9 rather than the 64 bit UID itself This feature is especially useful in the development phase as it helps to play with and understand browsing features more quickly HFP v1 6 Wideband Speech Overview To speed product development and integration Laird has developed a comprehensive AT command interface that simplifies application development including support for audio and headset functionality The Hands free profile HFP defines how two devices supporting HFP shall interact with each other on a point to point basis The use case for HFP is a hands free unit that is connected wirelessly to an audio gateway The audio gateway is typically a cellular phone The hands free unit acts as audio input and audio output of the cellular phone and allows control of typical telephony functions without physical access to the phone The major
12. g features such as automatic sniff mode sub rating for A2DP and AVRCP automatic management of discoverable connectable for multiples profiles based on connect and disconnect events AUtoBTX and optimized pre defined power settings AT amp F lt x gt with x 0 8 Other Overview BTM5xx modules include additional updates such as multi profile specification MPS compatibility layer for A2DP AVRCP and HFP improved compatibility for pairing with Android devices convenient display of link key type unauthenticated authenticated CSR Bluestack 26 g ADK2 5 and multiple bug fixes which are listed in the firmware release notes The release notes can be accessed from the Laird Embedded Wireless Support Site CSR ADK v2 5 Support Overview The latest production release of firmware for the BTM5 series firmware version 22 2 5 0 incorporates an upgrade to ADK 2 5 from CSR for the BCO5 MM chipset Laird s implementation of the ADK 2 5 in our AT command set contains upgraded A2DP encoders and decoders that are hard coded inside firmware Benefits This benefit is further enhanced by built in support for the apt x audio codec for wireline quality stereo audio This audio compression solution provides for the highest quality audio with very low latency for audio streaming devices Support is available at no additional charge The BTM5 series also supports Bluetooth s standard SBC SubBand Codec and the AAC Advanced Audio Codec which is Appl
13. icantly reduces the approvals compliance costs and overall risks of launching a new product in mass production The Bluetooth SIG approval held by the BTM5 series Declaration ID DO23160 as of v22 2 5 0 is called End Product Listing EPL This means that the module does not require any additional testing or approvals from a global Bluetooth perspective and allows the OEM to fully market their device using the Bluetooth name and logos The only obligations for the OEM as specified by the Bluetooth SIG are that they apply to become a Bluetooth Adopter at the Bluetooth SIG and pay to list their final end device on the Bluetooth SIG EPL listing A handy guide to the Bluetooth SIG process can be found at the end of the detailed HIG for the BTM51x OEMs can take advantage of the modules following Regulatory Approvals FCC Modular USA PI4510B part BTM510 and PI14511B part BTM511 IC Canada 1931B BTM510 and 1931 BTM511 CE Europe Declaration of Conformity incorporated into BTM51x User Manual MIC Japan R 201 125696 ADDITIONAL SERVICES Global Company Local Support Laird is committed to providing a robust and reliable Bluetooth development experience for all customers large or small Each BTM5 series module and development kit is backed by a comprehensive User Manual Quick Start Guides product videos and most importantly by regional technical support through our global Field Application Engineer F
14. its Application Note Currently CVC is not supported for the audio gateway role of neither HFP nor HSP In most use cases the audio gateway will typically be a mobile phone Now we can initiate the HFP link The link can be initiated from either end in the first table the link is intiated from the HF device BTM5xx with 318 1 AT HFD lt BdAddrHFG gt Initiate HFP service level connection SLC lt BdAddrHFG gt is what ATI4 returns on the HFG At the first connection a successful pairing should occur PAIR 0 Then we should see many HF indicators HFI and the CONNECT message AT HFA Initiate audio SCO link Response should be FS8000 INT sampling rate 8000 Hz internal codec CVCID BOQA CVC image with SYSID OxBOOA loaded HF AU1 HF instance audio connection established AT HFR Release the SCO link AT HFH Release HFP Service level connection SLC If SCO link exists it will be released automatically ATH Close all connections of the module This command can be used alternatively to AT HFH The second table lists AT commands for initiating the link from the HFG side BTM5xx AT HFGD lt BdAddrHF gt Initiate HFP service level connection SLC lt BdAddrHF gt is what ATI4 returns on the HF AT HFGA Initiate audio SCO link Response should be FS8000 INT sampling rate 8000 Hz internal codec HF AU1 HF instance audio connection established AT HFGR Release th
15. k for a valid license key at boot time and when a SCO connection is entered If a CVC image is loaded and the security check has failed ERROR 83 is returned f Laird Embedded Wireless Solutions Support 5 Americas 1 800 492 2320 Center http ews support lairdtech com Europe 44 1628 858 940 l Hong Kong 852 2923 0610 www lairdtech com bluetooth BTM5xx Series Features and Benefits Application Note In order to further assist customers with CVC integration Laird has produced a detailed Application Note to cover all aspects of the process In order to access this information which includes CSR specific information and IP a Laird NDA needs to be completed please contact your local Laird sales representative to expedite this process The diagram below shows a pictorial example of the CVC Development process and Appendix A covers an example of simple AT commands required to set up the enhanced audio link CVC Development Phases 1 Preparation 2 CVC Tuning 3 Production z pisa i CVC license key psr CSR PSTool Universal Front End UFE Univ Parameter Manager evc param AT Commands PsUpdate bat UART SPI SPI BTM5xx BTM5xx BTM5xx Time Music Manager The Music Manager is a Windows based application that allows you to configure and monitor A2DP post processing algorithms The Music Manager is available with the appropriate version of a Headset Applicati
16. k for learning purpose and for debugging Further improvement has taken place in the management of call records of the audio gateway instance HFG existing AT commands were enhanced to act more intelligent now depending on the current states of active and held calls You can set the AT commands using S registers which are documented in the BTM5xx user guide which can be accessed from the Laird Embedded Wireless Support Site In addition access to GPIO pins allows mapping for direct connection to actuator buttons on headsets Laird Embedded Wireless Solutions Support 2 Americas 1 800 492 2320 Center http ews support lairdtech com Europe 44 1628 858 940 l Hong Kong 852 2923 0610 www lairdtech com bluetooth BTM5xx Series Features and Benefits Application Note Lower Power Consumption Overview Low power consumption presents a major challenge for wireless devices Increasing numbers of battery driven devices as well as environmental aspects are main drivers of demand for optimized power consumption The BTM5xx comes equipped with sniff mode and sniff sub rating for HFP HSP and SPP Sniff mode is a configurable power saving mode of operation for Bluetooth devices Benefits In sniff mode a device checks in preconfigured intervals for incoming data The dormant periods are spent in a low power state allowing the device to save power when not transmitting Firmware v22 2 5 0 also comes equipped with additional power savin
17. mple rate tuning is required for the Speaker and User Parametric Equalisers Bass Boost and the Compander INTERFACE SUPPORT The BTM5 1x series is designed from the ground up to enable the widest array of audio applications for OEMs requiring mono and stereo audio capabilities In order to provide a broad range of interface options Laird provides for the following hardware interfaces on board the module UART Full 8 pin UART interface at 3 3 v logic level for command and data transfer PCM Four 4 signal lines lines shared with 12S I2S Four 4 signal lines lines shared with PCM Enable use of external codecs or wave file player recorder Select I2S master or slave role Enter Test mode 12S cross loopback internal codec bidirectional audio If 12S is selected for A2DP sink 44 1kHz and 48kHz are advertised as supported sampling rates in the SDP record fixed Hence the external codec must support both rates GPIO 4 x general purpose input output support 4 freely usable GPIOs available Function mapping e g volume up down headset button etc AVRCP operation id mapping e g Play Stop Pause etc LED 2 x LED output Note See the Automation section AT commands for on off blink pulse Automatic status indication connectable discoverable connected audio on with a range of pre defined blink patterns as of firmware version 18 1 4 0 AUTOMATION Overview The Automation features implemented in
18. nternal DSP adjusts automatically to the current air rate Whether there is an A2DP link with 48kHz or 44 1kHz air rate audio sink ongoing or whether a narrowband SCO 8kHz or a WBS link is active the I2S interface will present the audio stream at the chosen rate e g 48kHZz in all cases Clear Voice Capture CVC In order to further improve the audio quality supported by the BTM5 series Laird has included Clear Voice Capture CVC 7 generation in the module firmware Based on CSR ADK 2 5 1 the most recent firmware version 22 2 5 0 includes CVC 7 generation which enables noise reduction and echo cancellation CVC is a technology provided by Cambridge Silicon Radio CSR which utilises the BCO5 internal DSP in order to improve the audio quality of SCO links speech This includes sophisticated noise reduction and echo cancellation CVC works with both single and dual microphone headsets giving advanced audio enhancements and noise suppression to the near and far end as well as providing packet loss and bit error concealment Implementation Overview of CVC The BTM5 series provides for three different usage scenarios Headset with one microphone Headset with two microphones and Hands Free with one microphone with a separate DSP image for each configurable by AT command Whenever a SCO connection is established the selected image is loaded on the DSP before the audio stream is connected This is where the support of AT command
19. on Development Kit ADK It is important to use the version of Music Manager which corresponds to the DSP images contained in a BTM5 1x firmware release ATI38 helps identifying the image versions Ezurio Terminal Ver 6 8 0 lol x CTS DSA DCD RI RTS DTRIV BRK CAPTURES Echo Clear Data Transfer Test Open COM38 9600 N 8 1 The string ADK2 5 indicates that Music Manager which comes with CSR s ADK2 5 is the appropriate version to configure DSP post processing for each of the 3 A2DP decoders contained in this BTM51x firmware release These decoders provide a collection of audio effects to enhance or fine tune audio output Decoder Types SBC Decoder AAC LC Decoder APTX Classic Bluetooth Decoder security key required Audio Effects Speaker Parametric Equalisation2 Bass Boost3 User Parametric Equalisation Stereo 3D Enhancement 3 F Laird Embedded Wireless Solutions Support 6 Americas 1 800 492 2320 Center http ews support lairdtech com Europe 44 1628 858 940 f Hong Kong 852 2923 0610 www lairdtech com bluetooth BTM5xx Series Features and Benefits Application Note Compander Post Mastering Noise Shaped Dither Audio effects are provided for both 44 1 kHz and 48 kHz sample rates and are supported for all the specified decoders listed above The audio effects Stereo 3D Enhancement and Dither algorithms are sample rate agnostic However separate 44 1 kHz and 48 kHz sa
20. s for CVC ends From the beginning of a SCO connection with CVC the customer will use CSR tools namely Universal Front End UFE Universal Parameter Manager to parameterise and tune the CVC algorithms UFE is a powerful GUI that allows to hear new parameters immediately as they are written to the DSP for easier tuning CSR provide documents which describe not only the details of how to tune their CVC algorithms but also what needs to be taken into account when designing a headset e g mechanics position of microphones etc At the end of the tuning phase a psr file will be created by UFE containing all DSP parameters Once the customer has finished the tuning phase the DSP parameters need to be written to the BTM51x module in the customer s production environment For this purpose Laird provide a tool called PsUpdate bat which will modify PSKEYS DSP parameters over UART Using this tool guarantees the Bluetooth SIG approval remains valid In addition a license key is required for the CVC image for production This license key must be ordered from CSR approved distributors directly and written to the BTM5xx in the customer s production environment using PsUpdate bat The license keys vary in price versus volume one example Digi Key part BCSW CVC HS 1M FX has one of the keys as 0 55 per key for a MOQ on 2000 keys The Laird AT command set provides support commands for managing CVC license keys This includes a chec
21. single x Involves the purchase of multiple o gt component components which may increase cost M Fully approved from a Bluetooth SIG x Requires its own compliance testing Full perspective and maintains a wide range of for both Bluetooth and RF which y international RF approvals Leveraging increases time to market and cost Approved these approvals greatly reduces your testing time and compliance cost BTM5xx Series Features and Benefits Application Note Market and Applications The BTM5 series has been designed into a wide range of OEM products that require a reliable Bluetooth wireless link for high quality audio products Two types of applications for which BTM5 series modules are a good fit are stereo streaming applications and mono voice applications Stereo streaming applications include smartphone speaker docks wireless hi fi audio systems automotive multimedia devices and stereo headsets Mono voice applications include VoIP phones and gateways intercom systems vehicle hands free kits first responder audio intercoms and industrial audible alarm systems PROFILE FEATURES ENHANCEMENTS AVRCP v1 5 Upgrade Overview The update also incorporates an upgrade to version 1 5 of Audio Video Remote Control Profile AVRCP CT role The profile remotely controls audio or video streaming devices and has all the functionality of previous versions but now has extended control of the music player s database track information m
22. to the latest v22 2 5 0 firmware provide OEMs with increased flexibility and scope for their end product implementation These features allow the OEM to provide enhanced levels of functionality to their end users allowing for seamless intuitive audio connectivity to smartphones and audio devices Additionally the integration of higher level Bluetooth functionality into the BTM51x series modules reduces the processing burden for the OEMs host architecture potentially reducing the overall BOM costs Benefits Host less operation by push buttons no external microcontroller required for typical stereo headset speaker use cases Auto connect records allow configuration of automatic connections as soon as specified devices enter receiving range Status indication by LED blink patterns or GPIO outputs proving simple methodology to allow end users to determine Bluetooth connectivity status of the host device f Laird Embedded Wireless Solutions Support 7 Americas 1 800 492 2320 Center http ews support lairdtech com Europe 44 1628 858 940 Hong Kong 852 2923 0610 www lairdtech com bluetooth BTM5xx Series Features and Benefits Application Note APPROVALS In order to speed OEM customers time to market the BTM5 series of modules is fully approved from a Bluetooth SIG perspective and comes with a wide range of country RF approvals This enables OEM customers to utilise the module s approvals within their host product and signif
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