ALEKO TS-TC03 Ultrasonic Outdoor Bark Control for Pets Stop The Dog Barking Next Door, Designed specifically for outdoor use, this Deluxe Outdoor Ultrasonic Bark Control device is durable and weather proof You can choose from 3 sensitivity levels (activated at 15, 30 or 50 feet) as well as a test level audible to humans The Deluxe Outdoor Ultrasonic Bark Control alarm clock controls outdoor barking and no collar is needed! Safe and effective for all breeds and sizes of dogs Using ultrasonic sound to deter unwanted barking, Detects barks up to 50 feet with the use of an internal microphone Uses ultrasonic sound to deter nuisance barking,