*This product is designed to look like an alarm clock, the luxury outdoor ultrasonic bark stop can be hung on a tree, anywhere in the house or in your yard, it can be hung, placed on a table or anywhere *When the outdoor ultrasonic bark alarm clock detects excessive barking, the microphone will sense the barking and activate the component. *At this time, the product will emit a safe high-pitched ultrasonic sound, which can be heard by dogs but not by humans. The dog will stop barking when stimulated by the sound. Because the ultrasound can make the dog uncomfortable, the dog will stop barking. *Designed for outdoor use, the Outdoor Ultrasonic Bark Stop is durable and waterproof. There are 3 levels of sensitivity (effective range from 4.5,9 to 15.24 meters), and a test level. Requires a 9-volt battery, (not included), and has an average battery life of 2 months. *The Outdoor Ultrasonic Bark Stop has a power indicator that can be set to "Off" when you are away to protect the battery.