Interfit INT472 300 Watt/ Second Stellar AC/DC Flash Head for Stellar Extreme Bat (Black) Operates on AC or DC current. Fan cooled ensures capacitors and associated circuitry are kept to their optimum working temperature. S-Inch Type fitting allows the widest possible range of light shaping tools to be used. Audible or silent recharge indicator. Five f-stop stepless adjustment of both flash and modeling lamp.