HeartBeat Catalyst

A third-party Sega Mega Drive exercise peripheral with included body-mounted fitness sensors which reads heart rate, motion, and skin salinity levels for in-game feedback. Developed by American video game hardware developer HeartBeat Corporation and primarily sold alongside the Personal Trainer, it was released exclusively in the United States in November 1993. Notable for having a production run of only 1,000 units, and sold with the exclusive pack-in game Outback Joey, both are considered some of the rarest pieces of Mega Drive history in existence.