Compact interval timer times one or two intervals between two seconds and 99 minutes. Built-in Stopwatch and Clock feature. Secure and Removable Belt-clip included. Auto mode keeps repeating through intervals, up to 99 repeats. Chime and vibration interval notification; alarm duration can be set for one, two, five, or nine seconds. Size of a small pager. Powered by one AAA battery (not included); measures 2.25 by 1.75 by 0.5 inches (55mm X 44mm X 14mm). Sweat and impact resistant. For use with: HIIT, Cross Fit, Cardio, Weightlifting, Strength Training, Kettlebells, Body for Life, Running, Learn-to-Run, MMA, Tabata, Boxing, Martial Arts and more.