Built for fitness or competitive runners who want to improve the efficiency of their workouts.

* ECG-accurate - provides accurate heart rate data.
* Target heart rate zone is programmable with an audible out-of-zone alert.
* 50 lap memory provides lap time, split time and average heart rate for each lap count.
* Data mode recalls timing/lap memory, total time in target zone and average heart rate for each saved lap/run.
* View button accesses pulse and chrono modes.
* "S"-shaped design curves around the wrist for improved comfort and an easy read.
* Ergonomic chest transmitter enhances comfort.
* Nike Electrolite for one-touch backlighting.
* Mineral glass crystal is scratch-resistant.
* A battery hatch on watch and chest strap offers easy battery replacement.
* Water-resistant to 50 meters