Item Type: 35 Key Mini Numeric Keypad Material: ABS? Color: Black Connection Mode: 2.4G Wireless Effective Distance: Approx. 10meters / 32.8ft Battery Type: Built in 250mAh Lithium Ion Battery (Included) Number of Keys: 35 Keys 1?��U Shaped Keys: The 35 keys numeric keypad features soft press touch, U shaped keys that provide you with the most comfortable tilt angle to help reduce stress on your wrist.? 2?��Plug and Play: Numeric keypad requires no driver, plug and play, only one USB port is required, providing you with the most stable USB connection.? 3?��Low Noise: Wireless numeric keypad 35 keys is low noise and is perfect for working with spreadsheets, accounting documents or financial applications.? 4?��Support OS: Wireless number pad is suitable for various laptops and desktop computers with windowns98/95/NT/ME/2000/XP/Vista/7.0/8.0 and above operating systems.? 5?��ABS Material: Wireless number pad is made of ABS material, which is wear resistant and durable, not easy to damage, and can be used for a long time.