Ideal for travelers in dark hotel rooms, this packable alarm clock projects the time onto any ceiling in red numbers that are easily read at night. An LCD screen with luminous blue backlight displays the time, date, day, and temperature. A crescendo alarm with snooze function gets you up on time thanks to an internal receiver that uses signals from the official U.S. atomic clock to maintain permanent self-adjusting accuracy. Uses included AC adapter or two AA batteries (not included). 4 1/4''W x 2 1/2H'' x 4 1/2''D.