【𝐒𝐚𝐟𝐞 ＆ 𝐇𝐞𝐚𝐥𝐭𝐡𝐲 𝐁𝐚𝐫𝐤 𝐁𝐨𝐱】The dog barking control device is designed with high-pitched ultrasonic waves, which is harmless to pets and humans. Can anti barking devices indoors & outdoors, because barking control devices are ultrasonic which means that humans can't hear stop barking dog devices, but dogs can! Dog barking deterrents will attract the dog's attention, but will not cause pain and irritation. 【𝐌𝐮𝐥𝐭𝐢𝐟𝐮𝐧𝐜𝐭𝐢𝐨𝐧 𝐀𝐧𝐭𝐢 𝐁𝐚𝐫𝐤】The 3-in-1 anti barking device provides a safe and effective solution for dog training and bark stopper. Dog barking control device helps prevent dogs from barking, digging, clawing, and other unwanted behaviors. There should not be any walls or other obstacles within the field, as it will reduce the effect of the dog barking deterrent. 【𝐋𝐄𝐃 𝐓𝐨𝐫𝐜𝐡 𝐒𝐞𝐭𝐭𝐢𝐧𝐠𝐬】The anti barking device range up to 16.4 feet can not only prevent the from barking but the dog whistle to stop barking the front also includes 2 super powerful LED lights, press and hold the button to send out a dog barking control devices, which can stop the dog's aggressive behavior.