This deluxe bi-color bow light has a visibility of 1 mile for vessels under 12 meters (39.4 ft.) It meets the NMMA certification procedure. It is used with a 12v DC battery and has a red and green lens. It includes a 8 candle power lamp. It has 2 predrilled holes that are countersunk to accommodate #8 screws. The housing is made of chrome plated zinc with a black plastic base. The dimensions are 4 in. L x 3-1/8 in. W x 1-3/4 H.