Model RBMA five feet long.
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.
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