The Women's T4c Heart Rate Monitor by Suunto is equipped with Suunto Coach - the Suunto t4 adapts to your changing physiology by monitoring and analyzing your performance using Training Effect. With accurate data and feedback - you can develop a safe - effective training plan that helps you achieve your goals. Features: Suunto Coach (adaptive training advisor) Real-time Training Effect Current heart rate - average heart rate and maximum heart rate Real-time calories burned Three-tier zone training system with alarms Two adjustable heart rate limits with alarms Digitally coded for interference-free transmission Speed and distance data with optional Suunto Foot POD - Bike POD - Road Bike POD - or GPS POD Compatible with Suunto PC POD Dual time - date and alarm Log memory for 15 workouts Training totals for current week - previous week - and the last six months Stopwatch with 50 split laps Interval timer User-replaceable battery HR Belt with disturbance-free ANT transmission technology Water resistant to 30m/100 ft Interchangeable straps