Pet Ultrasonic Bark Stopper Dog Trainer, Random Color Delivery, Specification: UL20 1. Material: ABS 2. The appearance is designed like an alarm clock, the outdoor ultrasonic bark stopper can be hung on the tree, anywhere in the house or in your yard, it can be hung, placed on the table or other places at will 3. When the outdoor ultrasonic bark stop alarm clock detects excessive barking, the microphone will sense the barking and activate the part, emitting a safe high-pitched ultrasonic sound, which dogs can hear but humans cannot 4. The dog will stop barking when it is stimulated by the sound, because the ultrasound will make the dog feel uncomfortable 5. Designed for outdoor use, the device is durable and waterproof 6. There are 3 levels of sensitivity (the effective range is 5, 10 to 15 meters) and a test level 7. Requires 9V battery power supply (not included) 8. There is a power indicator, which can be set to "Off" to protect the battery when you are away 9. Effectively prevent dogs from barking and do not need to receive a collar, safe and effective 10. Weight: 0.3 kg 11. Dimensions: UL-10 10.5x7.5x11.9 cm, UL-20 11.35x7.95x12.55 cm Features: 1. Use ultrasound to stop dogs from barking 2. The effective range is 15 meters 3. 4 levels of operation 4. Durable and waterproof 5. The two-color indicator light shows whether the battery is sufficient 6. Can stop the dog from barking at a certain time 7. Train your puppy not to bark