All the essential tools without the added complexity. ECG-Accurate, programmable heart rate training zone with audible out-of-zone alert. Exercise chronograph recalls exercise time, average heart rate and time in target zone for last session. Time/date display with one alarm, "S"-shape design curves around the wrist to improve comfort, ergonomic chest transmitter provides increased comfort, scratch-resistant mineral glass crystal, Nike Electrolite one-touch backlighting., battery hatch on watch and chest strap provides easy battery replacement. Water resistant to 50 meters.
