Stronger Bark Control with 3X Ultrasonic Emitters: Unlike single-emitter devices, our upgraded dog bark deterrent —delivering 3X the coverage to quickly stop barking, biting, and jumping behaviors. Ideal for anti barking training, safer than bark collar, more effective than a dog whistle.Works for 97% dogs from 6 months to 8 years without hearing impairments，offers a humane dog training solution