Anti-barking device: At the push of a button, the device emits ultrasound that can only be heard by dogs. Instantly helps stop dog bad behavior like barking and digging. Safe for humans and dogs. Easy to use: the intuitive 1-button design avoids operating errors. Just press the button to activate the ultrasound. Press and hold the button to continue sending ultrasound. The maximum working time is 10 seconds each. Convenient to carry: the dog barking controller confirms the ergonomic design and fits well in the palm of your hand. With the mini dog trainer aid, you can easily take the bracelet with you anywhere. Ultrasonic Transmitter for Dogs: With a valid range of 5m / 16.4ft, it can be used as an excellent aid in deterring stray or let loose dogs from approaching you or your pet. Stay away from conflict and danger. Product description Ultrasonic canine repellant for indoor and outdoor use What is ultrasound? Ultrasound are sound waves with frequencies that are higher than the upper audible limit of the human hearing (approx. 20 kHz). Ultrasound does not differ in its physical properties from " normal " (audible) sound, with the exception that humans cannot hear it. How does our ultrasonic dog defense work? The high end of a dog's hearing range is around 45 kHz, and our device uses 25 kHz ultrasound, which humans cannot hear but dogs can. The ultrasound acts as an interference signal to stop your dogs' bad behavior, just as we stop working when we hear noise. With consistent use, your dog will find the connection between the two things and avoid such behaviors. What are the advantages of our device? Safe: Ultrasound is safe for both dogs and humans and does not interfere with anyone. Effective: Immediately stops bad behavior and tames a dog with constant use. Simple: 1-button design, easy to use, automatic shutdown after 10s of work Portable: Mini size, convenient to carry, great companion when walking with dogs What should you know before buying? 1. The device may not be suitable for dogs with hearing problems. 2. The device cannot be used on dogs under six months of age or over 8 years of age. 3. The device is not suitable for aggressive dogs. 4. Dogs' reactions to the device may vary from breed to breed. 5. Be patient while exercising. Technical data Material: ABS Frequency: 25 kHz Battery: 4 * AAA battery (not included) Control range: 5 meters / 16.4 feet Product size: 93 * 41 * 31mm / 3.7 * 1.6 * 1.2 inch