A free program for Android, by Chronus Stopwatches.

Stopwatch 2 is a professional stopwatch with a focus on real-world usability for sports and outside use. Designed with simplicity and functionality in mind, it provides the user with a unique experience that will enable you to monitor your performance in a variety of ways.

The stopwatch allows you to set a lap timer, set a lap duration, and then it will automatically start counting down. Once the timer is up, it will automatically switch to display the current lap time and it can be paused, reset, or started again. It also has a built-in lap counter and a built-in statistics page.

If you want to start the stopwatch, you can simply press the Start button. You will see the timer start counting down. If you want to pause the stopwatch, you can simply press the Pause button.