http://www.heartratewatchcompany.com/Suunto-M4-Heart-Monitor-p/suunto-m4.htm
The Suunto M4 heart monitor calculates caloric burn , pulse rate data and gives you workout ideas prior to , while active and plus after right after your exercise with a complete summary . This heart rate monitor also adjusts your upcoming training sessions by reviewing your own prior exercise intensity level giving you the very best in guided training.