Works with LiftMaster® models 2500, 3500 and 3800 garage door openers; Operates the garage door opener as if the power was still on (all safety and security features still operate); Audible signal sounds when door is moving under battery power; Bright LED lights let you know when the EverCharge® is charging, in use, or when the batteries need to be replaced. Works with LiftMaster® models 2500,
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