This second generation mio alpha 2 has all of the same features as the original award winning mio alpha plus more the mio alpha 2 heart rate sport watch provides accurate continuous heart rate monitoring at performance levelswithout a chest strap a customisable heart rate zone allow you to tailor your workouts to get the maximum results bluetooth smart 40 connects mio alpha 2 to popular fitness apps the best in heart rate technology packed into a comfortable sport watch that is so simpl