The PetSafe® Elite Little Dog In-Ground Fence™ Receiver Collar can be used to add another dog to your existing system or as a replacement collar. This lightweight collar is specifically designed for little dogs and features 4 adjustable levels of static correction plus tone-only mode for training. Trust PetSafe® to help keep your pet healthy, safe and happy. Features Purchase additional collars for every dog in your family Our smallest collar designed for dogs 5 lb and up Collar strap adjusts to fit neck sizes 6-16 in Reflective stripes on the collar strap 4 levels of adjustable static correction plus a tone-only mode Waterproof Battery-operated using 1 replaceable RFA-188 battery, included Compatible in-ground fences: Basic In-Ground Fence™ Rechargeable In-Ground Fence™ Stubborn Dog In-Ground Fence™ In-Ground Fence™ Elite Little Dog In-Ground Fence™ In-Ground Cat Fence™ In-Ground Fence™ - Refurbished Stubborn Dog In-Ground Fence™ - Refurbished Compatible pet barrier: Indoor Radio Fence® Our static collars are part of our ongoing mission to provide the best tools, education and support for pet parents seeking safe, effective, expert-recommended options they can trust to meet each dog’s unique training needs