Product specifications: Delivery quantity: 1 piece Color: blue black Other product features: 1. The product can be recharged repeatedly 2. The product uses large capacity lithium batteries, up to 60 days 3. The dog belt has a large diameter of 35cm and a small diameter of up to 6cm, suitable for all dogs 4. This product is waterproof and will not be pulled in strong wind or rain, please rest assured to use it! Product Description: In order to select the principle of the product vibration function, the dog barking is triggered for the first time. The warning sound comes out, the working finger automatically lights up, and the vibration output is the weakest, the dog will respond, the product will automatically reset the start mode, if the dog does not respond, enter the next function mode. The dog's bark is triggered for the second time. The warning sound is played. The indicator is on, and the light is automatically turned on, the vibration is issued, the dog reacts, the product