PetSafe In-Ground Fence System; Little Dog Collar. This extra receiver collar can be used to add another dog or as a replacement collar to the Elite Little Dog In-Ground Fence (PIG20-11041), formerly called the Deluxe Little Dog In-Ground Fence. This collar features 4 adjustable levels of static correction plus tone-only mode for training. Our smallest receiver collar Reflective safety strips woven into collar For dogs 5 pounds and up Fits neck sizes 6-16 inches 4 adjustable levels of static correction Tone-only mode alerts your pet with a beep Waterproof collar submersible up to 5 feet Uses PetSafe RFA-188 battery (included) Compatible with PetSafe in-ground fences except YardMax® Rechargeable In-Ground Fence (PIG00-11115) Also compatible with the Indoor Pet Barrier Transmitter (PIRF-100) to protect your pet indoors System Includes Test light tool Operating guide