1. [The red light at the bottom of the charging bin flashes, and the number of times each switch cap flashes is different, which represents how much electricity]
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2. [charging bin no power warning: open cover red light flash 6 times (3 times per second), indicating that the battery is too low and needs to be charged. The charging red light is on, and the full light is off. The time is about 2 hours, (the indicator is at the bottom of the charging bin)]
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3. [Charging compartment: The red light flashes several times to charge the headset several times, up to 3 times]