BLINKING LIGHT MARKER Military marker light that blinks in high-vis red. Requires 1 "D" size battery. Does not come with an on/off swith. these are used as temporary markers for trails, minefields and the like. Simply drop in the battery. twist the cap shut , stick in the ground and move on. the light will pulse a red light once per second, like a very low level strobe. blinks in only a 90 degree visibility range for decreased enemy detection. New, unissued.