Suunto m2m2 is the watch for easy real time monitoring of heart rate and calories equipped with the essential tools for reaching fitness goals the watch keeps you within the optimal training zone the m1 features a standard heart rate belt while m2 comes with a soft textile heart rate belt the suunto m2 watch is available in two different colours lime green and black key features of the suunto m2 real time heart rate real time calories real time training guidance three heart rate zones a