Anti Barking Device for Dogs - Dog Bark Deterrent Devices for Stopping Bad Dog Behavior - Ultrasonic Dog Bark Deterrent, Refuse to Shout and Slap - Best Anti Barking Device RechargeableDUAL SOUND WAVE MODES, COMPLETELY ADAPTED TO TRAINING NEEDSOur Dog Deterrent Devices utilize two safe and effective sound wave modes within a frequency range of 22 25KHZ. These scientifically alternating frequencies prevent your dog from developing immunity to a single tone. Whether at home or in the great outdoors, these sonic modes gently correct canine behavior while remaining safe and non irritating to human hearing, barking dog deterrent ensuring