Pet Dog Repeller Training Ultrasonic Anti Barking Stop Bark Device Ultrasonic Outdoors Control Training Anti-Noise  1. Ultrasonic anti-barking device can automatically detect dog barks 50 feet away. The barking control device automatically emits high sounds that only dogs can hear. After the dog stops barking, the ultrasonic barking control will automatically stop emitting ultrasound. 2. Ultrasound is harmless to pets and completely inaudible to human ears, so the device can be used safely 3. Can be hung on a tree, indoor, outdoor wall or fence to prevent dog barking (within range). When the luxurious outdoor ultrasonic barking alarm clock detects excessive barking, the microphone will respond to the barking and activating components. 4. Suitable for dogs from 6 months to 8 years old. Item Type: Bark Deterrents Model Number: Anti-bark device Product weight: 190G colour:Black Material:ABS size:12 x 6.5 x 9CM Package Contents: 1 x Anti-bark device 1 x USB cable 2 x Fixing screws and anchor points Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.