This is the largest, boldest digital clock we have - the huge numbers are 4 1/2" tall! Time includes hour, minute, and second. Also displays indoor temperature, date, and day of the week below in smaller 2" type. Keeps perfect time with the atomic clock, and automatically updates for Daylight Savings time (can turn off if not needed). You can use the fold-out arms to stand the clock on a flat surface, or you can hang it on the wall. Takes 3 AA batteries, not included.