Effective Dog Anti Barking DeviceOur pet gentle anti barking device provide a safety and effective solution for stop unwanted behavior. The stop dog barking device can effectively train your dogs to stop unwanted behaviors such as barking, fighting, chewing, poucing, digging, eating unsafe food, fighting, etc Safe for Dogs and HumanTouch the product at the bottom of the gear selector switch to "Chaser" button, the product at the top of the button switch "ON", the dog will run away. As long as dog repellent close to animals, and for 2-3 seconds, press the switch button, under the use of appropriate operation, only animals will hear ultrasonic , and humans will not hear the sound. Effective distance of 33 ft, 9v battery included. Handheld & Portable Our dog training device is designed portable and hand-held, you can use anywhere to train your dog and put it in your bag or pocket, makes it perfect for both indoor and outdoor use. The small device fits perfectly in your hand. It also prevents other dogs from approaching you while jogging, walking, or runningNote: 1. In drive the dog mode, due to a strong power, power consumption is bigger, please do not hold the switch for a long time, generally by 3 to 5 seconds, loosen the switch after then, and press it again. 2.Please don't use it near human ears. Works On All Size Dogs The bark control devices can be used on dogs of different breeds and sizes. But not recommended for dogs under 6 months because it may disrupt their hearing development, and also not effective in aggressive dogs or dogs with hearing problems. For better effect, do not use it in noisy environments