From what I could find, this type of ignition key was listed as "high security" or "non transponder" keys. Lexus used them in most of their models, until keyless ignition fobs came into being, but they could be found in other makes as well. From what I could find online, the only Mazda model that came with this type of key was the Millenia. The factory key had the remote door lock/unlock built in.