Wireless optical mouse Features & specifications: Radio 3d optical muose, with an usb receiver Radio frequency: 27mhz Resolution: 800dpi Battery: 3.6v Compatible with windows 9x/2000/me/nt/xp Install guiding: Step1: Connecting the receiver with the computer, the power light on the receiver are on. Step2. Activating the mouse and the receiver. Press the (matching code button)on the receiver. Then also press the button in the bottom of the mouse within 10 seconds. Step3. The rx light on the receiver are fishing, and the mouse are on working now. Cautions: 1. Please take away the batteries when you will not use the mouse for a long time. 2. Please put the receiver in the place where have a 30cm distance from other Electrical equipment and it will be more stable in perfor mance.