Normally off. S.P.S.T. Two positions: off - momentary on. On with button depressed. Spring return to off. Plasticized body sealed against moisture and dirt. Comes with M-407-03 black moisture repellent rubber button cover that snaps over special face nut. Two 18 gauge wire leads, 12" long. Mounting stem is 5/8"-32 diameter, 15/16" long. Fits panels up through 1/2" thick.