For use on vessels up to 39'. Visibility is 1 nm for Port/Starboard lights and 2 nm for All Round lights. Meets USCG requirements. Compact design fits most boats. 2-1/4" dia., 1-5/8" high. Stainless cap. Polycarbonate housing, lens and base. Stainless lamp holder. 12V, 10W festoon lamp. Port and starboard lights sold separately.