Suunto M2 Heart Rate Monitors

http://www.heartratewatchcompany.com/suunto-heart-rate-monitor-s/97.htm
The Suunto M2 comes with the Suunto Dual Comfort Heart Rate Belt so you can monitor your HR while you exercise. To ensure the most accurate reading of your HR, strap the HR belt to center of your chest and make sure the red arrow is pointing up.