La Crosse Technology Atomic Projection Alarm Clock Projects time and outdoor temperature on wall or ceiling. Projection rotates in 90 degree increments. Projection options 1 Default toggle between time and temperature, 2 time only, or 3 temperature only. Charge devices with USB universal serial bus charging port on back charging cord not included . Light up color display backlight and projection with a press of a button using battery power or continuous light with AC alternating current adapter On/Off option . Backlight and projection settings High, low, and off. Atomic time and date sets itself. 12/24 hour time with minutes. Snooze alarm and alarm icon. Calendar day and date. In/Out temperature F/C degree Fahrenheit/Celsius . Low battery icon for clock and sensor. 5.0V AC adapter included for primary power and battery backup batteries not included . Battery life 24 months. Temperature Range 14.2 F to 99.9 F; 9.9 C to 37.7 C indoor. 39.8 F to 139.8 F; 39.8 C to 59.9 C outdoor. Display Type Digital, Width 1.75 , Height 4.15 , Length 5.23 , Case Color Black, Dial Color Blue, Back Up Power Source 2 AAA 2 AA Alkaline Batteries, Pkg Qty 1, Package Type Clamshell