If your smartphone, tablet, or computer has Bluetooth, but your stereo or other speaker system doesn't, a good Bluetooth audio receiver lets you stream music wirelessly to your speakers with little loss in sound quality.
There are a lot of ways to solve this common problem. But the quick and easiest way is to assign Unique ID and unique password for each device (Bluetooth Audio Receiver, or Bluetooth audio receiver with built-in power amplifier)
Because our Bluetooth audio receiver with built-in amplifier has two audio source:
This device always switch the audio source automatically.
Bluetooth is always the first priority, even the AUX-In still hook-up the audio source from the audio player.
The only way to play the audio/music from AUX-In is once the Bluetooth is off-line.