Need different option – Timer+ · multiple timers Review

The interface for this app is nice and I like the choice of alarm sounds, but I am looking for a timer app that will give me a simple unobtrusive ding every 15 minutes (or other custom range of minutes) over a two hour period. I participate in long (2hr) meditations and just want a simple reminder (alarm) that can help me maintain my focus. An alarm which will not need turning off every time it goes off, during the two hour period. I can’t seem to make this alarm do that and there are no instructions that I can see, that might explain if this is possible with this app.
Review by GInaBlick on Timer+ · multiple timers.