A gentle nudge toward good behavior The PetSafe® Vibration Bark Control Collar offers 10 combinations of vibration correction. When the dog barks, vibration is delivered from one of the two Vibration Points. The duration of the vibration is random, which interrupts the dog’s bark. Features Ends Nuisance Barking – Uses 10 combinations of vibration to safely interrupt and deter your dog’s barking Battery Life – On/Off switch allows you to extend battery life when not in use; uses PetSafe® RFA-188 battery (included) Easy to Use – This durable and waterproof collar is adjustable to fit neck sizes up to 28 in LED Indicators – 3 color LED lights illuminate for good/low battery and test indicators