If you need a simple timer, we love the VisTimer app. We have it on the iphones and ipads. It's fast to set and change the time you want to measure. It has audio cues (early cues if you want as a warning). It has a minute/second countdown and it also makes a visual circle of the time that slowly disappears as time passes for a visual cue. We were going to buy the Learning Resources timer but found this to be much cheaper and way more portable!