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
Upgrade option when buying a truck door aka Positive Stop Assembly
This is installed onto the panel when the door is opened it is engaged and will keep the door open above the header so there is no hang down of the door.
The door will stay open above the header to eliminated the door being damaged.