Bark Stopper & Dog Silencer - Ultrasonic dog bark deterrent provides a safe and effective solution for dog training and bark control. The barking control devices effectively train your dog to stop unwanted behaviors such as barking, digging, chewing furniture eating unsafe food, fighting, etc.Works On All Size Dogs -The average human hearing frequency range is 20HZ~20KHZ, while dogs can hear a wider range from 15HZ to 120KHZ. Marina ultrasonic stop barking devices emit ultrasonic sound with a frequency of 24KHZ, so the sound does not affect humans, but can capture the attention of dogs.Rechargeable & Long Battery Life -The ultrasonic bark control device is equipped with a high capacity 1200mAh rechargeable battery. The included USB cable supports car, computer, power bank and adapter charging. The anti barking device can last up to 30 days of daily use after 4 hours of full charge. Use it indoors or for walking dogs and training them to behave well in public without worrying about running out of power.Convenience & Portable - Ultra-light weight of 2.33 ounces and ergonomic handheld design make the pet gentle bark control device great to carry in your pocket and easy to use whenever and wherever you are. Comes with an adjustable anti-static wrist strap and has a long range control of 16.4 ft. An LED light above the button indicates the working status. Marina bark deterrent is a great tool for walks or other outdoor activities.Professional Training & Instruction - Ultrasonic dog barking deterrent are dog friendly and safe for both people and dogs. Our goal is for you and your furry friend to understand each other. Repeated training and proper praise and rewards are necessary for best results. You can give your pet some treats to reinforce the conditioned reflex. Sonic dog repellents is effective for dogs with good auditory perception systems.