2024 New Rechargeable Sonic Dog Repeller Barking Deterrent for People with Dogs and People Without Dogs, People with Dogs for Dog Training, People Without Dogs to Repel Fierce Dogs. Working Principle The ultrasonic dog repeller sends 25KHz ultrasonic frequency, the dog can hear the frequency from 15Hz to 50KHz, ultrasound will not harm the dog, it will only make the dog's ears difficult to achieve the purpose of stopping the dog's barking behavior and repelling the evil dog. Target audience: large and fierce dogs, domestic dogs and dogs over 6 months, with excellent results. However, domestic dogs and puppies under 6 months or dogs older than 8 years old may not be very effective because their ears are not sensitive and cannot hear ultrasonic waves. Applicable distance: the maximum effective distance is 50 feet, and the effect is recommended to be better at a distance of 18 feet. There should be no blocking obstacles in the middle, because ultrasonic waves are sound waves of short wavelength that cannot overcome obstacles. Applicable environment: If the environment is very quiet, the effect is very good. There are sounds of moving cars, busy streets and large speakers suitable for the environment, which can interfere with ultrasonic waves and affect the driving efficiency of dogs. SAFE AND HUMANE SOLUTION - This barking dog deterrent uses ultrasonic sound technology, providing a safe alternative to traditional shock collars. It is designed to train your dog without hurting him, promoting positive behavior through gentle correction. Usage: Aim the dog repellent at the dog and hold the ultrasonic button. Most dogs will flee immediately. If the effect is not ideal, you can try switching gears. Technical parameters Brand: F