Garmin Forerunner 910XT GPS-Enabled Sport Watch GPS-enabled training device for multisport athletes. Tracks time, distance, pace (or speed), elevation (via barometric altimeter) and heart rate. Can be used for swimming, running and cycling. Battery life up to 20 hours. | Water resistant to 50m. The band is 4.25 on one side and 3.5 on the other side (total length with both sides of band is 7.75 ). Width of the band is 1.2