RFID Key Fob The RFID Key Fob is available for use with the GDS series and t he USB RFID Card Reader. This non-writable proximity induction card receives radio energy from the RFID Card Reader to power the card and its ability to interact with any GDS series device and the USB RFID Card Reader. This contactless ID key fob is easy to setup and use and therefore is ideal for use in a wide range of facility access attendance and security applications.