Description
Liftmaster 485LM Battery Backup for Liftmaster
The Liftmaster 485LM Battery Backup for Liftmaster 3850 Opener is very simple to install and can only be used with Liftmaster 3850(sold separately). This reliable backup system is always charged and ready and willpower your garage door to open and close up to 20 full cycles when the power goes out. A bright LED lights let you know that the system is working or when the batteries need to be replaced.
