RFID-to-Bluetooth selective adapter with multiple RFID integrated chips mounted on RFID elevator controller, having customized RFID transponders, a bluetooth module, and an extended I/O connector is disclosed. Customized RFID transponders include RFID Integrated chips, RFID sensor coils, and a SPNT switch. Extended I/O connector is configured to allow connection of customized RFID transponders by coupling to SPNT switches. Bluetooth module instructs which one of SPNT switches is to be opened or closed, which then connects one RFID sensor coil with one corresponding RFID Integrated chip, while other RFID sensor coils and remaining RFID Integrated chips are disconnected. Selection criteria of chosen RFID IC by Bluetooth module is in accordance with preconfigured allocated access right given to each user by an administrator and is programmed on flash memory, EEprom memory of Bluetooth module, in APP, or on cloud authentication server. More than one customized RFID transponder can be chained together.
