If you see "BL12-A3" appearing on your phone’s Bluetooth list:
Utilizes an upgraded Bluetooth 5.3 protocol, offering significantly better stability and lower latency than older entry-level modules. bl12-a3 bluetooth
A common complaint with this module is its lack of a "lock" feature. Since it is often always "open," neighbors may accidentally connect to it. To prevent this, the only physical solution is often turning off the mirror's main power switch or the bathroom light circuit. If you see "BL12-A3" appearing on your phone’s