Add extra dogs to your PetSafe In-Ground Fence system or Indoor Pet Barrier Transmitter. The Elite Little Dog In-Ground Fence Receiver Collar uses four adjustable levels of static correction and a tone-only mode for training. It fits dogs 5 lbs. and up with neck sizes from 6-16. Reflective strips woven into collar increase visibility and safety. Waterproof collar (submersible up to 5 ft.) uses an included PetSafe RFA-188 battery. Not compatible with Yard Max Rechargeable In-Ground Fence. Collar includes test light tool and operating guide. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Containment Systems.