This PowerPoint is a timer! It starts with 15 minutes and changes slides every minute. I use it with my guided reading groups. The large display in the room helps keep everyone on target. There is a chime when there are only 5 minutes left so students can stop and write any responses needed before the 15 minutes are finished. Then, when the time has passed there is a drum roll that lets students know it is time to change stations. It's simple -- but very effective!