RF304 22 Keys Numeric Keyboard Wireless Mini Keyboard USB 2.4G with Receiver . WIRELESS NUMERIC KEYPAD USB FOR LAPTOP PC Feature: 1. Support for Windows XP, Linux, Vista, Windows 7/8/10. 2. Wireless numeric keypad with 22 keys, plug and play USB connector. 3. Usage time up to 80 hours, keystrokes up to 3 million times. 4. Ergonomic design, more comfortable hand feel. 5. Scissor key cap design, high rebound speed, low latency. . WIRELESS NUMERIC KEYPAD USB FOR LAPTOP PC Specifications: Item Type: 22 Keys Numeric Keyboard Material: ABS Optional Color: Silver Black/Iron Grey/Pink Gold Support system: for Windows XP, for Linux, for Vista, for Windows 7/8/10 Number of keys: 22 keys Support wireless network: 2,4G wireless network Keyboard life (keystrokes): 3 million times Response Rate: 5 milliseconds Wireless transmission distance: approx. 10 m / 32,8 feet Operating Current/Voltage: 0,25 mA 3 V Usage time: 80 hours . WIRELESS NUMERIC KEYPAD USB FOR LAPTOP PC Package List: 1 x Numeric Keyboard (Battery Not Included) 1 x User Manual 1 x Receiver . WIRELESS NUMERIC KEYPAD USB FOR LAPTOP PC