General description The Safe Outdoor Ultrasonic Dog Bark Deterrent Device is designed to effectively control excessive barking in dogs. This device automatically detects barking from up to 15m / 50ft away and emits high-pitched sounds that are inaudible to humans but can be heard by dogs. It is a safe and humane way to deter barking, as the ultrasonic frequencies are harmless to pets. Technical specifications Detection range: up to 15m / 50ft Power requirement: 9V battery (not included) Power indicator: Yes Installation Can be hung on a tree, indoor or outdoor wall, or fence post. Usage Automatically emits ultrasonic sounds when barking is detected. Stops emitting sounds once the dog stops barking. Can be turned off to save battery when not in use.