1.DOG BARK CONTROL PET TRAINER Our Dog Anti Barking Devices provide dog bark control and stop actions like digging, fighting, chewing furniture, eating un foods, and other unwanted behavior. For the Ultrasonic Dog Bark Deterrent with three Modes (Chaser, Train, and Light), press the knob to the different modes to obtain the results 2.POWERFUL DUAL ULTRASONIC SPEAKERS The dog training and bark control device uses two speakers that reach up to 33 ft to deter unfriendly dogs. And portable design makes the stop barking dog device suitable for indoor or outdoor. You can use the ultrasonic dog bark deterrent to train your dog or carry it around to drive away. Highfrequency flashlights combined with ultrasound increase deterrence, especially at night or in lowlight environments 3.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 4.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 emit an ultrasonic sound and quickly LED flash the bright LEDs to correct a dog's behavior. The bright flashlight can also be turned on and used to light your way home