1. The Bluetooth headset will heat up when used for a long time, but the temperature is not too high, it is recommended to stop using when it is hot (change to external mode) to avoid damage to the headset and battery.2. Bluetooth headset is the application of Bluetooth technology in the hands-free headset, so that users can avoid annoying wires and easily talk in a variety of ways. Since the advent of Bluetooth headsets, they have been a good tool for mobile business people to improve their efficiency.