Features: 1.Made of plastic and nylon materials, safe and non?toxic, durable, no harm to pet healthy. 2.Low?power rechargeable, long?term use, nylon collar, soft material, anti?abrasive skin. 3.The level of the vibration can be adjusted according to the volume of the dog's barking, which is basically set to level 3 and can be set to level 5. 4.Once the dog barks, it will start to vibrate, if the dog continues to bark, it will vibrate for a longer period of time until the dog stops barking. 5.The unique vibration collar will increase the dog's memory, let them quickly learn that the feeling of vibration tells them to keep quiet. Specification: Item Type: Dog Vibration Collar Material: Plastic + Nylon Color: As Picture Shown Weight: Approx. 80.0g/2.8oz Battery: 180mAh Lithium Battery 502025x1 (included) Product Function: Vibration Working Method: Automatic Barking Control Scope of Application: Small Medium Dogs How to use: 1. Turn on the switch at the bottom of the transmitter and set the desired mode 2. Debug the strength, install the nylon collar 3. Just wear it for the dog PackageList: 1 x Collar1 x Data Cable1 x Transmitter1 x Manual