Liftmaster 485LM OEM Battery Backup Garage Door Opener

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Feature

Allows you to still come & go through your garage door, when the power goes out
Liftmaster 485lm battery backup system - chamberlain part number 4228- 100% omen
New production dates- liftmaster factory supplied
Also works with sears and home depot garage door battery back ups- replacement part
Compatibility for all battery back up units with slide in battery - 3850/8550 and new models