Compatibility: The mouse needs two pcs 1.5V AAA dry batteries to power it ( 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, This product does not include a USB B1uetooth adapter, if you need to use this product on a desktop computer without B1uetooth, please bring your own USB B1uetooth adapter