The Apex alarm clock features a digital display that shows time, calendar, alarm time and indoor temperature. It is easily viewed at night as it has Smartlite® technology, where a bright, green backlight illuminates the display as the room gets darker and turns it off again during the daytime to prolong the battery life. Smartlite® Automatic bright backlight for easy night time viewing Jumbo Digital display Calendar & indoor temperature display Crescendo alarm with snooze function Requires 2x AA batteries (not included)