Gymboss GB2009 SILVER Size of a small pager. Water and shock resistant. One or two different time intervals from 2 seconds to 99 minutes. The GYMBOSS now comes with a Stopwatch feature! Auto mode keeps repeating through intervals. Can set from 1 to 99 rounds. Special alarm/vibrate notifies you when preset rounds are completed. Alarm by beep, vibration, or both. Alarm duration of 1, 5, or 10 seconds. For use with: MMA, Boxing, Martial Arts, Cardio, Strength Training, Kettlebells, Body for Life, Weightlifting, Running, HIIT, Learn-to-Run, and more.