Product Description: This product is designed like an alarm clock, the luxury outdoor ultrasonic bark suppressor can be hung on a tree, anywhere in the house or in your yard, it can be hung, placed on the table or other places at will. When the luxury outdoor ultrasonic bark stop alarm clock detects excessive barking, the microphone will sense the barking and activate the part. 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 it is stimulated by the sound. Because the ultrasound will make the dog 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 (the effective range is from 4.5,9 to 15.24 meters), and a test mode. Requires 9-volt battery, (not included), average battery life 2 months. The outdoor ultrasonic bark suppressor has a power indicator, which can be set to "Off" to protect the battery when you are away. Limited use cycle, one year warranty. Excessive dog barking can take a toll on you and your neighbors. The Outdoor Ultrasonic Bark Stopper can effectively stop dogs from barking and does not require a receiver collar. Safe and effective for dogs of all breeds and sizes. 【Features】: 1. Use ultrasound to stop dogs from barking 2. Effective range 50 feet 3.4 levels of operations 4. Durable and waterproof 5. The two-color indicator light shows whether the battery is sufficient 6.9V Battery - (battery not included) 7. Can effectively stop your dog from barking 8. It can effectively stop your neighbor's dog from barking 9. Can prevent the dog from barking at a certain time 10. Train your puppy not to bark 11. Stop dogs from barking while camping 12. Microphone sensitive to sound: trigger ultrasonic sound. 13. Switch with 4 levels of operation: 14.OFF - used to save battery 15.Test - used to verify the functionality of the microphone and speaker 16.Low Sensitivity - short distance monitoring (15 feet) 17. Medium Sensitivity - (up to 30 feet) 18.High Sensitivity——high sensitivity (50 feet)