On your presentation, a timekeeper ting a bell. However, it's difficult for him/her to keep the time on the fascinating presentation (or boring and causing drowsiness one). Then, this app can keep time and ting a bell at predetermined times. Of course, the bell also rings when you tap it. ･ Several types of bell/vibration are available. ･ This app can run in the background even with the screen off unless you finish this app by the back key or recent apps. ･ Low CPU use rate (0.02s when this app is running in the background on Nexus 5)