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Smoke and CO2 detector

Hi

I need to find some Smoke and CO2 detector that are hard wire do not use 9v bateries as back up bu AA batteries
The main thing is that do not bip when the battery is dead but instead have a flashing light or any other way to show low batterie
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Frank Helk
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there is smoke detector with AA batteries
I looked because I can recharge those since the 9V are very hard to find rechargeable

Trowing batteries every year is just the ecological disaster I do not want to be part of

Thank you
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Excellent !!

no luck for smoke detector that do not beep when low batteries?
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