Description of Suunto T4 Black Volcano When? What intensity? And how long? The Suunto t4 shows the way. Equipped with Suunto Coach, the Suunto t4 adapts to your changing physiology, making on-target workout recommendations for achieving 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 2 adjustable HR limits with alarms Speed and distance with optional Foot POD, Bike POD or GPS POD Compatible with PC POD Dual time, date and alarm Log memory for 15 workouts Stopwatch with 50 split laps Interval timer User-replaceable battery HR Belt with error-free ANT transmission technology Water resistant to 30m (100 ft) Interchangeable straps Black volcano