Liquid crystal display w/6 digits displaying hr, min and sec; selectable functions of 12 hr time, 24 hr time, clock trip timer, stopwatch, down counter, set/reset; 14 or 28 vdc at 0.0025 amp power requirements with an internal aaa battery; 0.070 amp at 28 v external power for internal lighting at full brilliance; 2.500 in. Square flange; 2.250 in. Body dia; 2.200 in. depth