Stops Every Challenge — 2.7x Faster Behavior Modification: Chewer? Digger? Biter? Chaser? More than a bark control device, our indoor and outdoor dog training tools leverage the latest technology to get your pet's attention and stop them in their tracks. Squirrel! 3x More Effective Than a Dog Bark Collar - Don't subject your dog to the painful shock of a dog bark collar. Ultrasonic bark control devices combine auto-stop hearing safety with ultrasonic dog whistle technology to stop barking for happier neighbors, restful sleep, and a well-behaved pup! Premium Puppy Protection - Hold for Advanced Modes: With an 8-second ultrasonic auto-stop and a hold function that extends the whistle and strobe, this bark collar is the dog bark control device that strikes the perfect balance between fast training and protecting puppies' sensitive hearing. Tails-a-Wagging Guarantee - Tested and proven 3.4 times more effective than a dog whistle, with an ultrasonic mode that delivers behavior modification