Projection alarm clock with indoor temperature/humidity. Features: 12 hour/24 hour selectable time projection with rotation, time alarm with snooze, adjustable backlight, and calendar (month, day, weekday). Indoor temperature range: 32 degree F to 122 degree F (0 degree C to 50 degree C). Humidity range: 10% RH to 99% RH. Includes AC adapter for primary power. 2 AAA batteries for backup (not included). Type: Digital \nWidth: 2.17 In. \nHeight: 4.33 In. \nLength: 5.91 In. \nCase Color: Black \nDial Color: Black \nBack Up Power Source: 2 AAA Battery (Not Included) \nDisplay Height: \n