Looking for a clock that's easy to use? RCA has you covered with our conveniently designed alarm clock offering a simple interface and a large 4.6 inch LED display that's easy to read. The RCD11A features adjustable brightness control, a light sensor that automatically illuminates in low lighting, temperature display, calendar and count down timer. It's compact, lightweight, and completely portable with the 3 AAA batteries (sold separately). Features Adjustable brightness with light sensor that illuminates the display automatically in low lighting Temperature displayed in Fahrenheit or Celsius Alarm / light and snooze functions Full calendar with 12 or 24 hour options Count down timer Portable - battery powered (3 AAA sold separately)