Switch between Bluetooth 3.0, 4.0 and 2.4G The smart switch between Bluetooth 3.0, 4.0 and 2.4G ensures stable wireless transmission. You can still use your mouse regardless of USB port shortage or the loss of receiver. MT550 intelligently connects to the working device. It simultaneously connects to up to 4 devices, and switches among them with ease. It simplifies complicated cross-platform use and meets multi-tasking requirements. 12-month battery life With Rapoo's energy saving technology and power switch, you can use your mouse without power interruption for up to 12 months.