This high intensity strobe lights (5" long x 1" dim) were adapted to make prism and target acquisition easier, increasing productivity, saving hours and money. Even works on long shots with cluttered backgrounds. Rugged polycarbonate construction, weather resistant and lightweight 5 oz. The unit is powered by a single "C" alkaline (included) or rechargeable "C" battery. Custom strobe mount will hold one strobe and will fit standard 5/8x11 threads.