The Suunto T4D features include: Suunto Coach, 3-tier zone training system + 2 adjustable heart rate limits with alarms, digitally coded for interference-free transmission, Dual HR Belt with analog & digital function. It also displays the following: Current heart rate, average heart rate & maximum heart rate, real-time calories burned, speed & distance data, training totals for current week, previous week, & the last six months. It is water resistant to 30m/100 ft.