Atomic Desk/bedroom Alarm Clock Black-1.5&rdquo; Time Number, Back White Light Atomic desk alarm clock with large 1.5" time numbers Super bright back 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. It requires2 AA Batteries (Not Included)Measures 5" wide 4" high X 2" high