PRE-SALE!!! Save Over $60 by purchasing your MZ-3 Heart Rate Monitor TODAY!!! Exercise tracker and heart rate monitor with built-in memory and unrivaled versatility. Belt up, collect MEPs and go for your goals. The MZ-3 connects easily to your phone, favorite cardio machines and screens in the gym so you can workout your way. Go phone-free with built-in memory and make every workout count. Join millions of Myzone users and find your squad. Fun, fair fitness.