Dog barking deterrent devices is more effective and human dogs can hear a wider frequency range from 15hz to 120khz this bark control device emits ultrasonic sound at 25khz which is above the hearing range of humans but will easily grab dogs attention and make them feel uncomfortable press the button to stop your dogs bad behaviors like barking digging fighting and more help them understand that their bad behaviors will cause an uncomfortable experience Recharge dog barking control device with low power light Indicator this sonic bark deterrent usb rechargeable 300mah battery full charge in 1 to 2 hours for about 12 days of regular use saves you the endless hassle and invest in batteries when low power push the function button the indicator will be red 3 different frequency wave to avoid dogs getting used to simple frequency this stop barking dog devices can emit ultrasonic sounds with 3 different sound waves stable frequency undulating frequency and irregular frequency sound waves you can choose the different waves to void dogs getting used to simple frequency and it can make it reduce the training effect on the simple waves for a long time Human beep fucntion for conditioned reflex this dog barking deterrent devices has a beep function button you can press the beep button before every ultrasonic emission both beep and ultrasonic will help them understand that their bad behaviors will cause uncomfortable experience and at last your dog will establish a conditioned reflex to the beeping sound and you can stop their bad behavior just by beep function without ultrasonic punishment dog whistles that makes dogs stop barking Convenient outdoor use of 16.5 feet controls range with ultrasonic dog training device just fits nicely in your hand and comes with an adjustable wrist strap the dog barking deterrent devices of this sonic dog deterrent is 16.5 feet make it convenient for outdoor dog walking to training them to behave well in public and protect them from eating unsafe food you can also use it to stop a dog from coming to you