This quality interval timer will make any workout easier to plan and execute with more accuracy and consistency. * One or two different time intervals from 2 seconds to 99 minutes * Auto mode keeps repeating through intervals * Set up to 99 rounds * Manual mode acts as countdown timer * Stopwatch Function * Alarm by beep, vibration, or both * Alarm duration of 1, 5, or 10 seconds * Size of a small pager (1 3/4 x 2 1/4 inches) * Water and shock resistant * AAA battery required Maximize your training to increase: * Anaerobic endurance * Cardio endurance * Increased VO2max * Muscle strength, size, and endurance * Fat loss