ATOMIC DESK/BEDROOM ALARM CLOCK-1. 5" TIME NUMBER BACK BLUE LIGHT Atomic desk alarm clock with large 1. 5" time numbers. Super bright back blue light on demand to tell time in the dark. Always correct because it picks up time from the National Time Observatory in Boulder Colorado. Date day of the week and temperature are . 625" numbers. Measures 5" wide 4" high X 2" high. Used 2 AA Batteries (Not Included)