Power Pet Door Plus Electronic Fence Includes Humane Contain X-10 rechargeable multi-function electronic dog fence and Power Pet PX-2 electronic pet door; one collar controls both systems Uses proprietary technology to automatically adjust stimulus intensity based on distance from boundary, keeping pet contained without overstimulation Waterproof, outdoor mountable transmitter features illuminated status panel, wire break alarms, power boost switch and variable field width control Motor driven vertically-sliding door has directional sensing system that opens door only when your pet is on a direct approach, not just wandering by Wind and weatherproof with airtight seal; automatic deadbolt locking adds a level of security higher than any other pet door