Using this anti - barking device is easy. First, find a suitable place to hang it, like on a tree, indoor or outdoor wall, or fence. Make sure it's within the range where your dog usually barks. Plug it in using the provided USB cable. Once it's set up, it will start working automatically. It will detect your dog's barks from up to 50 feet away and emit ultrasound to stop the barking. When your dog stops barking, the device will also stop emitting the ultrasound. Note that this device is only suitable for dogs aged 6 months to 8 years. Keep it away from water and don't expose it to extreme temperatures. For maintenance, you can gently wipe it with a dry cloth from time to time. If you have any questions, refer to the instruction book included in the package.