Bluetooth headsets generally have one light and two colors, and the charging and no power state are generally indicated by red. The red light is always on when the Bluetooth headset is charging, it becomes blue when it is fully charged, and the blue light is always on without unplugging.
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Generally, the charging time of Bluetooth headphones is kept within 2 hours, because the charging time is too long, which will directly lead to the aging or even burning of the machine circuit board, and there will be a variety of inexplicable machine failures, such as shortened standby time, frequent disconnection, shortened call distance, and unable to turn on the phone. So, for the sake of Bluetooth headphones, please give them a proper charging time.