High Tech Pet Humane Contain HC-8000 Electronic Dog Fence Ultra System and RM-1 Radio Mat Pet Deterrent Kit Combo Humane Contain HC-8000 fence system + Radio Mat RM-1 kit; one collar safely contains pets outdoors and away keeps them from off-limits areas indoors Uses proprietary technology to automatically adjust stimulus intensity based on distance from boundary, keeping pet contained without overstimulation Progressive audible tones reinforce shock stimulus resulting in an even quicker, easier training process Radio Mat keeps pets off furniture, away from doorways, trash cans and anywhere else that's off limits to pets Radio Mat features three modes of operation: shock only, sound only and shock plus sound