LiftMaster 71-MLSBC Door Entry Field Kit, Single Button Control for Medium Duty Logic

This kit provides additional input to Open or Close. The input will function as a Close input when the operator is stopped at the open limit. The input functions as an Open input at all other times. This kit is to be used only in conjunction with a wall control with a stop button attached. Required on Medium-Duty Logic door operators for single-button control with external radio receivers.