Mini small portable pocket computer mouse for travel; 3.23 * 1.97 * 1.26 inch, net weight: 1.4 oz. Wireless optical mouse for laptop with USB receiver, powered by 1 * AAA battery (not included), 1600 DPI, 3 buttons. The USB receiver is placed at the bottom of the mouse; to find the location of the battery, please open the top cover gently from the back. 2.4 GHz fast wireless transmission, the operating distance is up to 10 meters; Compatible with Windows XP, Vista, Win 7, ME, 2000, Mac, Linux and more. If you do not connect, please turn off the mouse switch, lower the USB receiver, then plug in the USB receiver and turn on the mouse switch again, press the 3 buttons (left button, right button, scroll wheel) together at the same time for about 3 to 5 seconds