1. Support for for Linux, for Vista, for 7/8/10.
2. 22-key numeric keypad, USB plug and play.
3. Use time up to 80 hours , keystrokes up to 3 million times.
4. Ergonomic design, more comfortable handfeel.
5. Scissor foot key cap structure design, fast rebound speed, low delay.

Spec:
Item Type: 22 Keys Numeric Keypad
Material: ABS
Support System: for for Linux, for Vista, for 7/8/10
Number Of Keys: 22 Keys
Support : 2.4G
Keyboard Life (Keystrokes): 3 Million Times
Response Speed: 5 Milliseconds
Distance: Approx. 10m / 32.8ft
Battery Type & Capacity: 2 x AAA (Not Included)
Use Time: 80 Hours

Package List:
1 x Numeric Keypad (Battery Not Included)
1 x User Manual
1 x Receiver