Ultra Slim and LightweightPortable Design, snaps flat and slips easily into a pocket or bag. Cool power switch: Flattens for portability(power off), curve to use(power on).<br> Touch Ccroll Bar2-way touch scrolling lets you scroll both vertically for smooth, intuitive navigation. (Note: Can't scroll left and right).<br> Auto Sleep ModeThe mouse will fall asleep after 10 minutes no-operation, it can be waken up by clicking any button. The mouse needs two pcs 1.5V AAA dry batteries to power it(Not included in the package).It is recommended to use a new battery for power supply, if the voltage is too low, the touch bar scrolls abnormally or does not work.<br> Optical MouseFast tracking sensor, for smooth tracking on most surfaces, but not on glossy surfaces. Designed for use with either hand.<br> Bluetooth connection method<br> Put in the battery, bend the mouse, press and hold the left and right buttons at the same time for a few seconds, the mouse flashes blue light, then open the computer bluetooth search link, the bluetooth name is BT3<br> Bluetooth pairing method:<br> Press and hold the right button at the same time, blue light flashes after 6 seconds<br> size: 13*5.7*1.5CM