KMASHI Keypad 18 Keys Wireless Numeric Mini Keyboard Numpad 2.4G USB Number Pad Compact and Convenient Wireless Keyboard, Great Accessory for Small Laptops Without A Separate Keypad Sim design with built-in mini receiver and dustproof. Need an AAA battery (included in the package) Plug-and-Play: No device drivers are required.Nice keys feel,responsive,smooth flowing, rubber base make it non slip. Compact size: 18-key wireless numeric keypad. Hibernation mode enabled automatically, no power button needed. You will get: 1*Kmashi Portable Wireless Keypad, 1*Nano Receiver, 1* AAA battery , 1*User Manuel.