Dog Bark Control & Pet Trainer - Our Dog Anti Barking Devices provide dog bark control and stop actions like digging, fighting, chewing furniture, eating unsafe foods, and other unwanted behavior. For the Ultrasonic Dog Bark Deterrent with three Modes (Chaser, Train, and Light), please press the knob to the different modes to obtain the best results. Dog Bark Control & Pet Trainer - Our Dog Anti Barking Devices provide dog bark control and stop actions like digging, fighting, chewing furniture, eating unsafe foods, and other unwanted behavior. For the Ultrasonic Dog Bark Deterrent with three Modes (Chaser, Train, and Light), please press the knob to the different modes to obtain the best results. Safe for Dogs & Humans - The most humane and used widely way to keep your dog or your neighbor's dog from barking. The ultrasound of the anti barking device will not cause interference or harm to humans, because humans can not hear these frequency bands, but dogs will be sensitive to these ultrasounds. However, some dogs may be afraid or dislike this sound and will not stop barking at first, so please allow up to 2 weeks for training. LED Flashlight with Multi Settings - More than just a dog training tool and anti barking device, a super bright flashlight is included and can be used as a secondary way to stop an approaching dog. Holding down the button will not only emit an ultrasonic sound, but it will also quickly LED flash the bright LEDs and correct a dog's behavior. The bright flashlight can also be turned on and used to light your way home. Professional Tips - The dog deterrent device and anti barking device is not applicable to the following situations: aggressive dogs, noisy surroundings, hearing impaired dogs, more dogs together, dogs under 6 months or over 8 years.