This lightweight, waterproof receiver has 4 levels of static correction and a tone-only mode to match the sensitivity of your pet. It can be used to add extra pets to your existing fence or to replace your current receiver collar. It is compatible with all PetSafe® In-Ground Fence systems except for UltraSmart® and YardMax®. Trust PetSafe® to help keep your pet healthy, safe and happy. Waterproof Receiver Collar Adjustable Receiver Collar Short & Long Contact Points Included | PetSafe ® Ultralight Receiver Collar