Sandberg Wireless Numeric Keypad is what all laptops need – the quickest way to number typing. The numeric keypad is also wireless so that you can place it wherever it is most comfortable & avoid cable clutter. The tiny USB (Universal Serial Bus) receiver can be installed automatically without the need to install drivers & immediately connects with the keypad. General: 2.4 GHz GFSK technology Working distance: up to 10 metres Requires 2 x AAA batteries (included) Keypad: Power consumption: Max. 22 m A (w/o downstream device) Key switches: Membrane switch with tactile feedback Keycaps type: Low profile Switch Life: 3 million cycles Receiver: USB (Universal Serial Bus) interface Power consumption: 5V DC