Liftmaster 50105 Coil Cord 4 Wire, 18 ga, 20 ft Sensing Edge Connections
Each sensing edge requires a means to connect it to the door operator. The means must be able to extend and retract as the door moves. Coil cords and take-up reels fulfill this function. A wireless connection may also be used.
IMPORTANT NOTE: TAKE-UP REELS ARE NOT RECOMMENDED FOR USE WITH ANY FAILSAFE TYPE EDGE. USE COIL CORDS ONLY.