... battery CR123 as power, built-in IC chip control LED flash, this light has 9 user-selectable flash patterns: ROTATE, double blink ... ,000 hours; .9 patterns of flashing and warning modes, lighting covers 360 degree direction, visible for up to 10 miles away; 3 ... two strong magnets, can be attached on iron surface; Safety light, Warning light, led flashing lights,led warning lights