This app provides a timer for High Intensity Interval Training (including Tabata). It allows you to select the training time and resting time for each set, and allows you to select the sets per exercise. The timer provides both a visual countdown display of the time remaining, for each set, and an audible beeping for the last five seconds of each set. You therefore know when a set ends without even looking at the display, allowing you to focus on your training.
There are labels for the number of exercises, and sets, as well as the total time of exercising. There is a start / pause button, and a reset button. You can change the training time, resting time, and number of sets while exercising, allowing you to mix and match for different exercises.
Tabata is 20 seconds of exercising, followed by 10 seconds of recovery, done for 8 sets and a total of 4 minutes.