Feature: 1. Stable Connection: 2.4Ghz wireless technology, plug and play, no device driver, stable signal transmission, no delay digital keypad 2. Compatibility: Compatible with for Android Tablet numeric keypad, for Linux, for Chromebook for Windows XP, for Windows Vista, for Windows 7, for Windows 8, for Windows 10 series 3. Professional Design: Full size 18key keyboard. Professional design, suitable for laptops, banks, schools, companies and so on. The keycap of a numeric keypad has a life time of more than 10 million times 4. Ergonomic Design: ABS material, compact and slim design, numeric keypad is easy to carry around, 18key numeric keypad is easy to press and quiet, ergonomic tilt and non slip pad on the back provide optimal comfort 5. Power Saving Technology: Power saving technology, extended service life, don't worry about your laptop numeric keypad battery Specification: Item Type: Numeric Keyboard Material: ABS Key Life: More Than 10 Million Times Type: 2.4GHz Key: 18 Keys Product Size: Approx. 140 x 86 x 20mm / 5.5 x 3.4 x 0.8in Battery: 1 x AAA Battery (Excluding) Interface: USB. Package List: 1 x Numeric Keyboard 1 x USB Receiver Note: The device is delivered without batteries