Visible at a distance of over 1 NM, with eyelet to attach to sailing jacket or lifejacket..
100 % reliable, unbreakable, non-corrosive, watertight, floating, nontoxic.
Does not produce any flames or sparkles, nonflammable, does not require any batteries and can be used in a variety of circumstances : Man overboard, gas leak, electricity failure or black-out, engine breakdown, windward use, in or below the water, mooring light...