1-5 of 5 Answers
The actual contact sensors as small and do not require batteries nor charging.
Sorry, there was a problem. Please try again later.Cr123a
Sorry, there was a problem. Please try again later.Special ring battery, last at least for an week... and still 69% after a lot of usage.
Sorry, there was a problem. Please try again later.Already installed, they are rated for months
Sorry, there was a problem. Please try again later.3v lithium , cr123
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