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why use bluetooth earphone small or without sound

possible reason:
1. The earphone is too far from the mouth
2. The microphone hole of the earphone is blocked or has entered the water.

possible reason:
1. The earphone is too far from the mouth
2. The microphone hole of the earphone is blocked or has entered the water.

Precautions:
1. When the earphone is in use, the earphone should be worn well and not be too far away.
2. Keep the Bluetooth earphone clean and do not enter the water, otherwise the internal electronic components are easily damaged.