Cool power switch Place the Arc Mouse in its curved position to turn it on. Click again to flatten and turn off. The touch bar replaces the wheel of a normal mouse. (Note: Before to use the mouse, you need to bend the mouse to turn on the power. If the mouse is flat, the power is off and cannot be used.) Ultra-thin and portable The lightweight, easy-to-carry mini arc bluetooth mouse goes anywhere without the weight or bulk of traditional mice. Plus, you can lay it flat and slip it easily into your back pocket or your bag for traveling. Bluetooth wireless connection Bluetooth wireless connection save the USB port for the computer. (Bluetooth pairing: press the left and right button simultaneously for 6 seconds, then the blue light flashes to enter d mode. 'pairing) Compatibility Suitable for devices with Bluetooth function such as laptops, tablets, smartphones, etc. (Note: This product does not include bluetooth USB adapter, if you need to use this product on computer desk without Bluetooth, please bring your own Bluetooth USB adapter.) Professional customer service The mouse needs two 1.5V AAA dry cell batteries to power it (not included in the package). If you have any questions, we will provide professional customer service for you.