1. Plug and PlayThis wireless number pad does not require driver installation or complicated setup. Simply install 1 AAA battery and plug the USB port into your computer to provide stable transmission over a distance of up to 10m. 2. Comfortable FeelingThis number numpad is ergonomically designed to provide you with the most comfortable tilt angle, which can reduce the pressure on your wrist. The keys are highly accurate and raised, and the comfortable pressing sensation improves work efficiency. The rubber plate on the bottom of the keyboard is firmly affixed to prevent the keyboard from sliding, which can effectively fix your numeric keypad on the desktop. 3. Auto Sleep FunctionWhen the numeric keypad is not used for 5 minutes, it will automatically enter the sleep mode, no need to worry about the power consumption, and can maintain a longlasting standby. When the power is low, the indicator light will be on to remind you. 4. CompatibleThis USB numpad keyboard mechanical is suitable for all kinds of laptops and desktops with Windows 2000, Windows XP, Windows ME, Vista or Windows 7/8 and above.