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 levels – without a chest strap. A customizable heart rate zone allows you to tailor your workouts to get maximum results. Bluetooth Smart (4.0) connects Mio ALPHA 2 to popular fitness apps. The best in heart rate technology packed into a comfortable sport watch that is so simple to use.