PetSafe Vibration Bark Dog CollarThe 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: 10 combinations of vibration correction Perfect Bark sound and vibration sensors only your dog's bark causes correction Automatic safety shut off: correction stops after 80 seconds Durable, waterproof