ELI5: How do hotel door electronic locks know your card is valid vs. cancelled if they're not talking to the front desk all the time? Submitted by kepler1 t3_125dwqx on March 29, 2023 at 5:14 AM in explainlikeimfive 11 comments 8
mikeholczer t1_je42z4x wrote on March 29, 2023 at 7:24 AM The new card is programmed by the front desk to tell the lock that the previous card should be disabled. The old card isn’t invalidated until the new one is used. Permalink 2
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