The Gymboss is a small and easy to use interval timer popular with weightlifting and crossfit. The Gymboss interval timers can also be used as a stopwatch, countdown timer or clock. The Gymboss multi user timer allows user specified times of single or dual intervals with alarm notification by beep, vibration or both. The Gymboss Interval Timer is perfect for training, crossfit, hiit, running, MMA boxing and interval training.