Times Up

Yes! I know there are a lot of timers out there and most of them have bells, whistles and fizzly pops.
What we have here is a simple, basic, idiot proof timer that does the job.
Rather than entering seconds, minutes or hours (or all three), we have gone for three buttons, 1 minute, 10 minutes and 30 minutes.
Each time a button is touched, the time will increment by that amount, touch "clear" to begin again.
What could be easier?