Welcome to our store! 1. Stable Connection: 2.4Ghz wireless technology, plug and play, no driver needed, stable signal transmission, no lag. 2. Compatibility: Compatible with Android tablets, Linux, Chromebook, Windows XP, Windows Vista, Windows 7, Windows 8, and Windows 10. 3. Professional Design: Full 18-key numeric keypad. Professional design, suitable for laptops, banks, schools, businesses, etc. Key lifespan of over 10 million presses. 4. Ergonomic Design: ABS material, compact and slim design, easy to carry. Easy-to-press, quiet keys; ergonomic tilt and non-slip pad on the back for optimal comfort. 5. Energy-Saving Technology: Energy-saving technology extends battery life. Item Type: Numeric Keypad Material: ABS Key Lifespan: Over 10 million presses Type: 2.4GHz Keys: 18 keys Product Size: Approx. 140 x 86 x 20 mm / 5.5 x 3.4 x 0.8 inches Battery: 1 x AAA battery (not included) Interface: USB Package Includes: 1 x Numeric Keypad 1 x USB Receiver If you encounter any product issues after receiving your item, such as damage or incorrect quantity, please contact us immediately. We will do our best to provide you with satisfactory customer service.