Cause：
Electromagnetic waves interfere with the Bluetooth connection, resulting in no sound.
Please check your phone's volume setting to make sure that the phone volume is not turned on and is on silent.
The phone is far away from the earbuds, beyond the effective transmission distance (10m), or there is an obstacle blocking the connection between the earbuds and the phone. For example, the phone is in your pocket.
Solution:
1. Make sure your earbuds are not in an environment with strong interference, away from objects with high electromagnetic interference such as microwave ovens.
2. Turn on the volume of your phone.
3. Use your phone and earbuds together, or reconnect them.
4. Disconnect, put the earbuds back into the charging case and close the lid for 5S, then open the lid to reconnect with the phone or disconnect the phone from another Bluetooth device.
5. If the above does not solve the problem, please try to restore the factory settings, within 30S at the same time five successive touches left and right ear touch control (not playing music or talking state), hear the beep, then restore the factory settings.
