Length 2-1/16", width 1 1/8", height 13/16". Threaded 3/4", long male nipple for standard 1/2" KO, turn-on, turn-off ratio : 1 to 3. Single pole, single throw switch, color coded 6" leads, wiring diagram included. Contact position at night: normally closed ballast V.A. -1100, 1200W.