Anti-Barking High-power Dog RepellerOverview: This Anti Bark Device will trigger after more than three times barking, effectively filter out some false triggering caused by environmental noise or dog occasionally bark. Design by sound control and fitted on the wall, easy to install. Come with a rotary wall holder, which makes the device can rotate 360 degrees freely. Humans cannot hear the ultrasonic, NO harm to human and dog, safe to use. Note: 1. Do not install in damp, leaking