✺ 【Ultrasonic Barking Control】When your dog (or your neighbor's dog) starts barking, the unit emits a safe but annoying high-pitched ultrasonic ; when the barking stops, the tone also stops. ✺ 【Clear Transmission】Whether you are training your dog, your neighbor's dog, this anti-barking device will automatically detect and stop the dog from barking through ultrasonic s. Ultrasonic transmission is clear and bark detection up to 16.4 feet. ✺ 【Meet Your Training Needs】The anti barking device designed to provide a variety of options to meet your training needs to stop your dog from barking. ✺ 【USB Rechargeable】It takes 3-4 hours to fully charge. When fully charged, the device can work continuously for 8 hours without worrying about running out of power. The small bark stop device fits perfectly in your hand. ✺ 【Waterproof Function】The dog barking control devices have IPX5 waterproof function and is not afraid of wind and rain, so you can install it outside the house to stop the barking of dogs near your house.