OPEN only (all LiftMaster operators) or SAFETY only (LiftMaster operators with type B2 C2 L2 T T1 or TS control wiring) after vehicle passes over treadle.
The weight of the vehicle compresses an electric switch which sends an open signal to the door.
Requires a 2-wire connection to the operator but does not require power to function
Was previously MWRTA02A now has a new board making installation easier
Includes single channel receiver (MWR12A) and transmitter (MWTA12) with audible low battery alarm.
This feature that activates when the battery has only 25% of its life remaining indicating the battery should be replaced. The alarm sounds for 5 to 10 seconds at 1 to 2 minute intervals.
The receiver operates on either 12 or 24 volt AC/DC and provides N.O. or N.C. output.