Characters can be developed and evolved according to the amount of activity such as heart rate and number of steps taken VBM Card Set Ultraman vol.1: Ultraman Zero & Zetton” is the latest addition to the “VBM Cards” that work with the “Vital Bracelet Characters” wearable LCD toy series. It is a set of two VBM cards, “VBM Card Ultraman Zero” which contains the evolution line of Ultraman Zero and its derivatives, and “VBM Card Zetton” which contains the evolution line of Zetton and its derivatives. ***VBM Cards are not guaranteed to work with Vital Bracelet Digital Monster or Vital Bracelet Digivice V-. ***The VBM card is not compatible with the Vital Bracelet Lab application.