All safety and security features operate as if power was on.
Audible signal sounds
Bright LED lights alerts.
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Battery Backup System
Keeps opener operating. Operates the garage door opener (and safety features) as if the power was still on. Sounds alerts.Audible signal sounds when door is moving under battery power. Charge notifications.Bright LED lights let you know when the Battery Backup is charging, in use, or when the batteries need to be replaced.