XP30 Release Pet Dog Repeller Ultrasonic Dog Training Device Rechargeable Anti Dog Bark Deterrent Device With LED FlashlightWhile only 10% of dogs become immune to our already advanced 25kHZ dog barking control devices we refuse to stop short of 100% effectiveness, so we added an undulating 20 to 30 kHZ 10 second ultrasonic boom. 100% painless. 100% effective. For 300% faster dog training than a dog whistle to stop barking, dog clicker for training, bark box, bark collar, air horn for dogs or in person dog training program. Makes Training Stick 2. 7x More Effective than