Amazon.com: Ultrasonic Dog Training Bark Control Device for Small Amazon.com : Ultrasonic Dog Bark Deterrent Device: Anti Barking Control Anti Barking Device, 3 Frequencies Dog Deterrent Devices, 33Ft 2 Pack Anti Barking Device, Dog Barking Control Devices up to 50 ft Amazon.com: Anti Barking Device, 1500 mAh Rechargeable Ultrasonic Dog Amazon.com : blugpt Ultrasonic Dog Bark Deterrent Device: Anti Barking. Product features: 1. An 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 an 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, or 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 activate components. 4. Suitable for dogs from 6 months to 8 years old. Packing list: 1 x Anti bark device 1 x USB cable 1 x Instruction book Looking for more options? Explore our full collections to find styles you??? ll love. And Visit our Canadian Store