Description: 1. Train collar size: suitable for dogs of small, medium and large sizes. 15 pounds or larger. Durable and adjustable nylon collar. Size ranges from 14 to 24 inches long. 2. 7 levels sensitivity adjustable for different dogs and environments. 3. Easy testing method to check the electric shock collar. 4. Easy to operate and ergonomic transmitter, effective and safe training system with automatic protection modes. Specification: Item Type: Fully Automatic Pet Trainning Collar Material: ABS, Nylon Color: Black Fully Automatic: Yes Note: Error is allowable due to manual measurement please a lot of understandings: ). Package Included: 1 × Collar 1 × Nylon Belt 1 × Test Light 1 × Battery 4 × Contact Point