The miniMAX is an advanced model, designed for timing extremely complex interval programs consisting of more than 2 different intervals. If your program only has 1 or 2 different intervals you DO NOT NEED THIS MODEL. Due to the nature of complex intervals this timer is harder to setup than the Classic or Plus model Gymboss and requires more patience to learn how to use it. If you do purchase this model, we do have printable, expanded instructions on our website help page. 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.