The DL3FE 2-factor models come with 2 RFID tags in the box. 

Our RFID chip functions within the 13.56 MHz ISM band. Most smart cards are compatible, but most small wearable or implantable RFID devices function on the non-compatible 120-150 KHz range. However, some 13.56MHz wearables are now available, and should be compatible with the device.