Simple "countdown" Timer. (Android application)Vibration alarm.The best to use for…-Countdown timer-Presentation, Speech (Silent timekeeper. Put your mobile phone in your pocket.)-Napping (wake you up by vibration.)etc…Alarm rules:-When it remains 1 minute.(fixed)-When it remains 30 seconds.(fixed)-When it remains 5 minutes.(optional)-Every minute on the minute.(optional)