Generally, there are three situations:

1. The earphone is not used for a short period of time (within one month), and the battery of the earphone reaches the limit. At this time, it needs to be charged for 3 hours, and the battery circuit can be activated before starting.

2. The earphone has not been used for a long time (more than one month). The battery inside the earphone has become damp and rusted, so the battery is useless, so it can't be turned on. Please change it at this time.

3. The earphone can't be turned on suddenly in normal use. This is because the battery has been used too many times or the battery is inferior, and its service life is up.