This software counts down in seconds from 1800 when it reaches 0 you will hear 3 loud noises. It has 3 buttons built in to it Start, Stop, Reset. The start button starts the timer, the stop button can be used as a stop or pause button. This is quite handy because if you need to stop the timer while doing something else you can then resume from where you left off. The reset button will reset the countdown timer to it's default which is 30 minutes showing as 1800 seconds. The download size is very small so you will hardly notice any space has gone. The colour of this app is teal green. I have many different timers on my site.