Countdown Timer and Stopwatch description

A simple countdown timer and stopwatch, to use it as a countdown timer set the timer to anything other than 00:00:00 and press start-; to use it as a stopwatch clear the timer to 00:00:00(default) and press start+.

It works when you switch to other apps or your screensaver goes on. It still works on calculate time even if you turn off your phone.