ALWAYS ACCURATE ATOMIC CLOCK. Keep track of time, date and temperature with this water-resistant atomic clock. It automatically adjusts to the correct time based on signals from the U.S. National Time Observatory. It even updates the time for daylight savings! Perfect for bathroom or kitchen use. Hang it, stand it, or use the suction cups on the back to attach to any smooth surface. Easy to read 1.5” numbers. 6.5” diameter. Uses 1 AA battery (not included).