The Serene Central Alert Wireless Notification System is an all-in-one hearing loss notification system for your home. The Serene Central Alert Wireless Notification System alerts you to all the daily sounds in your home such as the alarm clock, door knocks, telephone rings, and alarm sounds from your audio alarms, as well as providing warnings from your motion detectors and storm warnings from your NOAA radio. (Accessories that are sold separately are required for some of these functions.) This hearing loss notification device uses a bright built-in flasher, a selectable loud, yet pleasant audible sound, and a powerful bed shaker to alert you. No installation is needed for this notification system, and all operations are wireless. 1-Year Warranty.