Some computers are left on 24 hours a day for backups, call tracking, virus scanning, video recording, or other reasons. Often it's important to hear computer sounds during the day because they relay desired information, but at night this can be irritating. You can try to remember to turn the volume off or down at night and then back up during the day, but it's easy to forget. For only US$4.95 per computer, Quiet Time can do this for you, seven days a week, 365 days a year.