1. CONCEPTRONIC The Conce pt of Global Communication Specification sheet Conceptronic USB Calculator with Numeric Keypad and 2 ports hub CNUMCAL2 Expand a notebook with a numeric keypad calculator and 2 ports hub This multifunctional notebook peripheral allows you to carry a calculator numeric keypad and 2 ports USB in just one device It is an easy and fast solution to input numbers on your notebook with a fully functional 19 key layout and an ultra slim lightweight design Specifications General specifications Minimum system requirements e USB interface USB 1 1 and 2 0 e Computer with an available compatible USB port Calculator can be used standalone Normal and detachable USB cable Included accessories 2x USB 1 1 ports e Multi language manual Automatically powered by USB port Detachable USB cable or by battery e Battery for standalone mode Battery 1 year warranty Weight 100g Warranty 3 year 1 year on battery