Allows you to still come & go through your garage door, when the power goes out.Liftmaster 485LM Battery Backup System can only be used with Liftmaster 3850(sold separately)
Product DescriptionMODEL 485LM EverCharge® Integrated Standby Power System For use exclusively with the LiftMaster model 3850 garage door opener Operates the garage door opener as if the power was still on (all safety and security features still operate) Standby Power System and opener are one logic board, resulting in
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