Included components Anti Barking Device. Anti Barking Device, Frequencies Dog Deterrent Devices, 33ft Stop Pet RRP £40. 4-HOLE ULTRASONIC BARK STOPPER: 2023 new type of dog bark stopper with 2 more ultrasonic emitting holes than traditional Bark Stopper, after thousands of Bark Stopping Tests on different breeds of dogs, we found that the Bark Stopper with 4 holes has better Bark Stopping Effect.
eBay