The PetSafe Deluxe No Bark Dog Collar features our patented Perfect Bark Technology simultaneously sensing both sound and vibration, and only a combination of sound and vibration will trigger the electronic correction. The PetSafe Deluxe Anti Bark Dog Collar accurately detects your dog's bark every time. Some dog bark collars detect barking with a microphone and activate on sound, these can be set off by other noises or by another dog's bark. Some bark collars use only vibration, these can be set off by motion or jostling. Only the PetSafe Deluxe Bark Control Collar with Perfect Bark Technology ensures fool-proof bark detection.