Safe and Harmless: The anti bark device uses high frequency ultrasonic technology, which will not cause harm to humans or dogs. But it can easily attract dogs&39; attention and prevent them from continuous and excessive barking.Automatic and Convenient: Unlike traditional dog training collars, this ultrasonic dog bark stopper can automatically detect dog barking, emit ultrasonic sound and stop it, completely freeing your hands to stop your dog or your neighbor&39;s barking. /p>Rechargeable and durable: The SiBei anti bark box has a built-in 1500mAh rechargeable lithium battery that allows it to be recharged via a USB cable. Only 5 hours full charge can work continuously for 30 days. ( Note: the output current is not more than 2A. )Waterproof and Durable: The shell of this ultrasonic dog bark control device is made of sturdy IPX4 ABS, waterproof, weatherproof and crushproof, which gives it a longer lifespan and allows it to be hung anywhere, anywhere. inside as well as outside. (Take it home in case of heavy rain)Main Features1. Automatic dog barking detection and ultrasonic emission to stop dog barking / Automatic ultrasonic stop when dog stops barking.2. Durable material, waterproof, anti-burst, sturdy, weatherproof.Note: Please take the device home when it rains heavily3. Small, lightweight, easy to install, place or hang anywhere.4. Maximum effective range up to a distance of 33 feet.5. Suitable for all breeds and sizes of dogs.6. Cut: 3.34in*2.83in*3.54inInstructions for Use1. Turn on: Press and hold the inchpowerinch key for 3s, with a short beep sound and a flashing red LED.2. Switch off: Press and hold the inchpowerinch key for 3s, with 2 short beeps and red LED flashing.Note1. Not recommended for dogs over 50 kg.2. Not recommended for dogs under 6 months and over 8 years old.3. Not recommended for hearing impaired, grumpy or aggressive dogs.4. Not recommended for use in a particularly noisy environment.5. Not recommended for the use of a device intended for 2 or moreProduct colour: whiteNumber of pieces delivered: 1 piece