Compact, advanced interval timer tracks up to 25 different intervals between two seconds and 99 minutes. * Save up to 20 programs. * Built-in Stopwatch and Clock features. Secure and Removable Belt-clip included. * Chime and vibration interval notification; alarm duration can be set for one, two, five, or nine seconds. * Compact size 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, Boxing, Martial Arts and more.