New outdoor ultrasonic bark arrester1. Product function This product is designed to look like an alarm clock. It can be hung on a tree, placed anywhere in the house or in your yard. It can be hung, placed on a table or other places. When the ultrasonic bark suppressor alarm clock detects excessive barking, the microphone will sense the bark and activate the components. At this time, the product will emit a safe high pitched ultrasonic sound that can be heard by dogs but cannot be heard