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BEEP
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:
Android only
This feature is available only for Android devices
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