Once you open our software, you'll get a list of available mbt devices.
If you have multiple, you can check the back of the amplifier for its Serial Number. The last three digits of the Serial Number are in its Bluetooth name. Identify the device and select it in the list of available devices.
BONUS: If your device supports Android app connection, you can connect it without entering the app! Using an NFC tag that's hidden in the amplifier's housing.