The number pad is plug and play, which is convenient to use.It is the high sensitivity and quick rebound of the number pad that allows for smooth and comfortable using experience.Made of ABS material, the number pad is eco-friendly and durable to use.The length of the number pad is 8.5cm, width is 12.3cm and height is 1.8cm, so you can carry it outdoor with you conveniently.The number pad is compatible for Windows, for Android and for Mac OS.Item Name: Wireless Number PadMaterial: ABSModel: RF304Color: Black, Iron Grey, Silver Color, Rose Golden ColorSupport Wireless: 2.4GWireless Transmission Distance: 10mWorking Current/Voltage: 0.25mA/3VBattery Type: 2 x AAA Batteries(Not Included)Compatible System: for Windows, for Android, for Mac OSFeatures: Plug Play, Sensitive, Ultra-thinSize Details: 8.5cm x 12.3cm x 1.8cm/3.35" x 4.84" x 0.71" (Approx.)Notes:Due to the light and the screen setting difference, the item's color may slightly differs from the pictures.Please allow slight dimension difference due to the manual measurement.Package Includes:1 x Wireless Number Pad(Battery Not Included)1 x Receiver1 x User Manual