Ultrasound design: based on the theory that ultrasound, the dog trainer can effectively train your dogs to be obedient and stop some unwanted behaviors, such as barking, digging, chewing and more, also they are harmless to both humans and pets Easy to operate: first open the battery cover and then put 1 piece 9V battery (not included), the sound is audible only to pets, finally turn on the switch and it can work well, also they can serve as a flashlight when necessary Handheld and convenient: size of the device is approx. 12.5 x 4.5 x 2.
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