Specification:Item Type: Wireless Keyboard and Mouse SetMaterial: ABSWireless Frequency: 2402MHZ-2480MHZWireless Channel: 16 (Automatic Frequency Hopping)Maximum Mouse Acceleration: 14 Inches Per SecondUSB Signal Receiver: 10 Meters DistanceMouse Working Voltage/Current: 3V/10MAKeyboard Working Voltage/Current: 3V/3MAKeyboard Battery Specifications: 2 AAA Batteries (Not Included)Mouse Battery Specification: 1 AAA Battery (Not Included)How to Use:1. Install the battery (not included) into the keyboard and mouse.2. The usb signal receiver is plugged into the computer usb interface, then it can be used.Package List:1 X Keyboard1 X USB Signal Receiver1 X Mouse1 X Keyboard Film1 X User Manual