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>You can read the specifications: they all are AC coupled with poor
>It was also interesting to see which tricks worked on the ultrasonic
>and IR motion detectors,slow movement or thermal isolation (can use a cardboard)
> but none involved a PCB.no, but everyone is interested in security
>If you think about it, carrying a RFID key, keycard, or even a simpleright
>barcode tag would be safer than a fingerprint lock.