Features: 1.Support for Windows XP, for Linux, for Vista, for Windows 7/8/10. 2.22-key wireless 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.specification:Item Type: 22 Keys Numeric Keypad Material: ABS Optional Color: Silver Black / Iron Grey / Rose Gold Support System: for Windows XP, for Linux, for Vista, for Windows 7/8/10 Number Of Keys: 22 Keys Support Wireless: 2.4G Wireless Keyboard Life (Keystrokes): 3 Million Times Response Speed: 5 Milliseconds Wireless Transmission Distance: Approx. 10m / 32.8ft Working Current / Voltage: 0.25MA 3V Battery Type & Capacity: 2 x AAA (Not Included) Use Time: 80 HoursPackageList:1 x Numeric Keypad (Battery Not Included)1 x User Manual1 x Receiver