Bark Free emits either ultrasonic or audible sound to discourage the dogs from barking and is designed to turn on automatically when barking occurs. The Bark Free will automatically train most dogs that barking results in an unpleasant ultrasonic response. This "training" is most effective against boredom barking, and is less effective against territorial behavior or trained behavior. In about 70% of cases, the Bark Free is very effective within 24 hours of being installed. The remaining 30% will vary between taking several days or weeks to train and being very difficult to train. Sometimes older dogs or breeds with congenital hearing problems are unable to hear the ultrasonic sounds emitted and ignore the Bark Free. This is also true of situations where there are other loud noises close to the Bark Free. The ultrasonic sound emitted may be masked by other noises .

Product Features:

• 110v AC adapter for Bark Free product.