Flexible wired connection between a sensing edge and its controller 2 Conductor 18 Gauge Extends to 20 Feet Wire at both ends, no plug Alert Stamping 900-EPD-METAL Retracting Reel is a flexible wired connection between a sensing edge and its controller, such as a door operator. As the door moves, the wires extend along with it, and retracts back into the reel. The Retracting Reel eliminates dangling cords, allowing for a cleaner appearance.