the following example is for you reference.


Features:

WKM-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. 

 

Technical details:
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 AA 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: 800 CPI    
* Tx Technology: 2.4Ghz transmitter technology    
* Hand Orientation: Ambidextrous    
* Input Power: 1 x AA batteries    
* Dimension (mm)/ Weight: 100.17 (L) x 55.86(W) x 35.9 (H)/ 48g
    
* Accessories    1 x Keypad, 1 x Mouse, 1 x Nano receiver, 1 x User's manual