Sandberg Wireless Numeric Keypad 2 - General: 2.4 GHz GFSK technology Working distance: up to 10 metres Requires 1 x AAA battery Keypad: Power consumption: Max. 22 mA (w o downstream device) Key switches: Membrane switch with tactile feedback Keycaps type: Low profile Switch Life: 3 million cycles Receiver: USB interface Više informacija na linku