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I have a MyQ Garage Door system and the unit just started beeping, roughly every minute
(lemmy.dbzer0.com)
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Every 30 seconds. But went and removed the battery -to stop the sound- and it's still running after plugging it back in lol. But I'll be buying 2 batteries from them for $51, and waiting until they're arrive. I guess it's a law in California to have a battery backup?