DOG BARK CONTROL & PET TRAINER - Ultrasonic Dog Bark Deterrent with three Modes (Chaser, Train, and Light). Switch modes by turning the knob to select the best result for your dog. KEY FEATURES - Dual ultrasonic speakers reach up to 33 ft to deter unfriendly dogs. Portable and suitable for indoor or outdoor use. - Three operating modes: Chaser, Train, and Light. Use the knob to select the mode that fits the situation. - Safe for dogs and humans. Ultrasound is inaudible to humans and designed to be a humane training aid. Some dogs may fear or dislike the sound initially; allow up to 2 weeks for training. DESIGN AND PERFORMANCE - More than a bark control device: also a training aid for unwanted behaviors such as digging, fighting, chewing furniture, and eating unsafe foods. - High-frequency ultrasound combined with a visual cue to increase deterrence, especially at night or in low light. - LED flashlight with multi settings: a bright secondary tool to deter an approaching dog or to light your path home. Holding the button emits ultrasonic sound and triggers rapid LED flashes. USE SCENARIOS - Indoor training: use the Train mode to reinforce quiet behavior and reduce repeated barking inside the home. - Outdoor deterrence: take the device on walks or use in the yard to deter other dogs and curb unwanted actions. - Nighttime safety: use the Light mode for visibility on dark sidewalks or while guiding your way, with the added ultrasonic cue if a dog approaches. Note: The device is designed to be humane and non-disruptive to humans. Training time can vary by dog, with gradual improvement over up to two weeks.