WMK-2600 is an ideal external mouse & keypad for notebook users. A Reliable 2.4 GHz wireless with nano-receiver connects both the Numeric keypad and optical mouse using just one USB port. Simply plug and play without any setting. The Keypad supports non-synchronous function. This feature can let keypad independently be used from the notebook keyboard, leaving the notebook keyboard free for text typing. Keypad Specification (WKP-2600) * Key Number : 20 keys, including NumLock Hotkey * Tx Technology : 2.4Ghz transmitter technology * Switch Mechanism : Membrane with rubber dome, great tactile response * Travel Distance : 2.5 +/- 0.5mm * Key Force : 55g +/- 5g * Input Power : 1 x AAA Battery * Special Feature : Support non-synchronous function * Dimension / Weight (N.W.) : 122.74 (L) x 83.21 (W) x 19.1 mm / 90g Mouse Specification (WMS-2600) * Button Number / Switch : 2 buttons with one scrolling wheel/ 1 power switch * Tracking Method : Optical * Resolution : 400 CPI * Tx Technology : 2.4Ghz transmitter technology * Hand Orientation : Ambidextrous * Input Power : 2 x AAA batteries * Dimension (mm)/ Weight : 95.8 (L) x 57.1(W) x 36.7 (H)/ 52g (include Nano Rx.) * Accessories1 x Keypad, 1 x Mouse, 1 x Nano receiver, 1 x User's manual