If you’re considering buying an Idesco Door Handle 7N - also sold by U&Z as the CX6172 elektronischer türdrücker apparently - then don’t bother: I went see the manufacturer and tried to make it work with my magic Chinese Mifare Classic 1k implant, but it just won’t see it. I mean it works fine with the exact same chip in credit card format, but not with the implant version.
As far as I can tell with the DT RFID Diagnostic Card, when the door handle is waiting for a tag to be presented, it sends out weak probe pulses. Then when it sees something that responds to the pulses, it goes into full power and reads the tag’s UID. It probably does this to preserve the battery. But the unfortunate side effect is that the probe pulses are too weak for an implant to wake it up.
That’s too bad, because the product is clever and very well made. It would have been better with an IR proximity detector or a button to wake it up or something. I really wanted one for my new home, but… there ya go: no joy with implants with this one