The BEEP component allows you to play a beep sound on the smartphone when the barcode is scanned.
If you hear two beeps it is because you have the
Enable camera beep enabled on the app settings which is a separate feature. Disable it:
This feature is avaialble only for Android devices only
If you don't hear anything
Make sure that the
Do not disturb mode is disabled and also that the media volume is turned on