Garage Door Openers : Commercial Operators : LiftMaster Model DH

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Description:

INTERNAL DOOR LOCK SENSOR
Features Internal Door Lock Sensor which detects of the door lock is engaged, stopping operation to eliminate jamming and damage to the door or operator. This adjustable sensor also detects excessive force or a door jam, conditions caused by failure to release the lockbar of a rolling grille. There is no longer any need for wiring guide-mounted interlocks.