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.