Dog Bark Deterrent Device Stops Bad Behavior Stops All Challenges—2.7x Faster Behavior Modification: Chewer? Digger? Biter? Chaser? More than an anti-barking device, our indoor outdoor dog training tools leverage the newest NPS Alpha technology to grab your pet's attention and stop them in their tracks. Squirrel! 3x More Effective Than Dog Bark Collar - Don’t subject your dog to the painful shock of a dog bark collar. NPS Alpha Ultrasonic Dog Barking Control Devices combine auto shut-off hearing safety with ultrasonic dog whistle to stop barking technology for happier neighbors, restful sleep, and a well-behaved pup! Stop Neighbors Dog from Barking . 1 Hour Rapid Charge - Long Lasting 32 Hour Battery: 1000mAh bark control device charges fast and works hard - whether you’re using dog whistle mode, strobe mode, flashlight mode and 25 kHz ultrasonic training mode to modify behavior without stop. Premium Pup Protection - Hold for Advanced Modes: With 8 second ultrasonic auto-shut off, and a hold function that extends whistle and strobe, this barking collar nemesis is the dog barking control device strikes the perfect balance between rapid training and protecting pups' sensitive hearing. Tails-a-Wagging Guarantee - Tested and proven 3.4x more effective than a whistle for dogs, with an ultrasonic mode that delivers up to 2.7x faster behavior modification than the best dog obedience programs.