Product description Dogs are our best friends, but do you feel helpless and annoyed when a dog is barking without control? It's time to try this Ultrasonic Dog Bark Control Deterrents and gentlely say goodbye to those endless barking. 3 Levels of Operation Modes: - Low Range: up to 15 feets - Middle Range: up to 30 feets - High Range: up to 50 feets Usage: - Hanging or mounting this bark control device on a tree, wall or fence to keep your own dog or your neighbors dog from barking. - Make sure the microphone is less than 5 feet high and is facing the direction of the barking dog. Specification: Power Supplies: - Material: ABS Plastic Color: White Suitable Range: All sizes or breeds of pet dogs Note: - Humans cannot hear ultrasonic waves, but precautions should be taken when preparing to use outdoor bark controls. - If the dog starts buzzing when you install, install or hang the outdoor bark control device, please keep the arm away from the human ear to avoid hearing damage. - If the dog is deaf or hearing impaired, he may not react to Outdoor Bark Control.