Alert yourself about important events with different alarms and replace your tray clock using different skins. Alarm clock that will play a MP3 file. It also can run a program, log off, reboot, shut down, or power off. Atomic Alarm Clock also an atomic-time synchronizer and advanced replacement for Windows tray clock, over 100 skins are included in the distribution. This alarm clock is built into your personal PC and is completely customizable.