Check: whether the wire is connected to the musical instrument or patch, whether the patch falls off from the body and whether the strength has been adjusted.

Solution: Reconnect the instrument or patch, re-paste the patch, and adjust the force to the appropriate gear.

Needle sensation on skin surface

Check: whether the patch is close to the body and whether the skin is too dry.

Solution: Re-paste the patch to make it completely fit the body. Alcohol cleans the skin surface, making it clean and moist.

The operation is not responding.

Check: whether the instrument is dead, and check whether Bluetooth is connected.

Solution: Charge the instrument, and then reopen the software to connect Bluetooth.