Features: Completely waterproof. Five levels of programmable correction. Levels are easily changed with a push of a button on the receiver. QuickFit buckle allows for a quick release and a perfect fit every time. Low battery indicator light – Lets you know when the batteries need replacing. ASIC Microchip – chip the size of a match head with 3000+ filters to prevent unwanted correction. NOTE: It is compatible with all PetSafe brand underground fences and Radio Fence and Pet Guardian Underground Pet Containment Systems.