Meets CE and USCG requirements for 1NM visibility for sail or powerboats under 39'. Meets ABYC A-16 requirements. Meets NMMA Certification Procedure. 2V DC - 8 CP lamp included. Pre-drilled with two countersunk holes to accommodate #8 screws. Housing is chrome plated zinc with black plastic base.. Size: 4" x 3-1/8", 1-3/4 H base dimensions.