Product Description.Designed to look like an alarm clock, this outdoor ultrasonic bark stopper can be hung from a tree, anywhere in the house Or in your yard, it can be hung, placed on a table at will or anywhere else. When the Outdoor Ultrasonic Bark Stop Alarm detects excessive barking, the microphone will sense the barking and activate the component. The product will then emit a safe, high-pitched ultrasonic sound that the dog can hear, but not the human. The dog will be stimulated by the sound and will stop barking. Because the ultrasonic sound will make the dog feel uncomfortable, the dog will stop barking. Designed for outdoor use, the outdoor ultrasonic bark stopper is durable and waterproof. There are 3 levels of sensitivity (effective range at 4.5,9 to 15.24 meters), as well as a test level. The Outdoor Ultrasonic Bark Stop has a power indicator that can be set to "Off" to protect the battery when you are away. Limited use period, one year warranty. Excessive dog barking can be a problem for you and your neighbors. The Outdoor Ultrasonic Bark Stop is effective in stopping dogs from barking and does not require a receiving collar. Safe and effective for all breeds and sizes of dogs. Product InformationProduct unit weight: 0.19KG/setColor box size: 9.5 * 7.5 * 12CMProduct Category:Dog trainerMaterial:ABS