Specifications: Working range: up to 10m Battery: 2*AAA Battery(Not Included) Transmit power: + 5db Max Working voltage: 3.3V Operating current: <50mA(on), <1mA (sleep mode) Charging current: <300mA Colour: Black Size: Approx. 14*9.5*2cm/5.51*3.74*0.79in Package List: 1 * Keyboard(No Battery) 1 * User Manual 1 * USB Receiver