Safe and Harmless: The anti barking device uses high-frequency ultrasonic technology, which will not cause any harm to humans or dogs. But it can easily attract dogs' attention and prevent them from continuous and excessive barking. Automatic and Convenient: Unlike traditional dog training collars, this ultrasonic dog bark control device can automatically detect dog barking, emit ultrasound and stop it, completely freeing your hands to stop your dog or your neighbor's barking. Rechargeable and Durable: The SiBei anti barking device has a built-in 1500mAh rechargeable lithium battery that can be recharged via a USB cable. A full charge of only 5 hours 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, which is water-resistant, weather-resistant, and crush-resistant, giving it a longer lifespan and allowing it to be hung anywhere, indoors and outdoors. (Take it home in heavy rain) Main Features 1. Automatically detects dog barking and emits ultrasonic sound to stop dog barking / Automatically stops ultrasonic sound when the dog stops barking. 2. Durable material, waterproof, anti-burst, sturdy, weather-resistant.Note: Please take the device home when it rains heavily 3. Small, lightweight, easy to install, place or hang anywhere. 4. Maximum effective range up to 33 feet. 5. Suitable for all breeds and sizes of dogs. 6. Size: 3.34in*2.83in*3.54in Instructions for Use 1. Turn on: Press and hold the "power" button for 3s, with a short beep and a red LED flashing. 2. Turn off: Press and hold the "power" button for 3s, with 2 short beeps and a red LED flashing. Note 1. 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 use with a device intended for 2 or more dogs. Product color: white Number of pieces delivered: 1 piecebecomeveryrich