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The rolling dial on the side of our Dog Silencer unit is not a volume control.
This is the Bark Sensitivity dial, which tells the microphone how sensitive it needs to be in order to hear the barking dog. You want that dial set to your specific situation. If the dog is near the device, that dial should be fairly low, and if the dog is going to be farther away, that dial should be rolled higher.
You don’t want the microphone listening out further away than what is necessary, otherwise it might hear other environmental noises and the device could react to those and you don’t want that. You only want the DSM to activate when the dog barks to ensure effective training.