Sportdog In-ground Rechargeable Fence Add-a-dog. This pet accessory by SportDOG Brand allows pet owners the ability to train their pets to stay in line. The Add-A-Dog accessory is a step up from the collar model as these contain a rechargeable lithium ion battery that charges in two hours and lasts up to one to two months on a single charge. The Add-A-Dog accessory can help to prevent your pets from pulling you over in the yard helping to prevent them from running away. With this collar you and your pet can effectively communicate with each other. It features seven levels of static stimulation as well as vibration and tone so it's easier than ever to keep your pet safe and secure. As an added bonus the Add-A-Dog accessory is waterproof and rated to be submersed to 25 feet ensuring reliability in any environment. Boost your training efforts by adding a single dog receiver to your current SportDOG Brand Rechargeable In-Ground Fence system with this collar receiver. Specifications for Sportdog In-ground Rechargeable Fence Add-a-dog: Manufacturer: SportDOG Length: 6.55 in Dimensions: 3.25 X 6.00 X 6.55 in Package Contents: Sportdog In-ground Rechargeable Fence Add-a-dog Sportdog In-ground Rechargeable Fence Add-a-dog