Designed by an HIIT athlete who was tired of clock-watching, Set Starter is the world"s smallest interval timer for monitoring rest between sets and timing your training. Set Starter is easy to use. As seen on the TODAY Show, SHAPE Magazine, and other media, the device fits on your thumb. Convenient, one-touch operation lets you focus on your workout. Vibrations and lights alert you to when you need to start/stop your intervals or rest periods. There"s nothing else like it! Use in a variety of activities, from CrossFit, Run/Walk, HIIT to Pilates, Tadata, etc.