the keychain is connected to an electronic device and has a remote control on it
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Door Control Access Control System DC12V 1CH Momentary/Latched 3A A-ON B-OFF / Press-ON Release-OFF Output 0V Switching Value - AliExpress 13

Door Control Access Control System DC12V 1CH Momentary/Latched 3A A-ON B-OFF / Press-ON Release-OFF Output 0V Switching Value

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