Approved for USCG 2NM (Colreg 2 mile). Constructed of injection molded nylon and aluminum. 12VDC. Low amp draw. Installs with two #8 FH fasteners (not included). All USCG approved navigation lights must be mounted properly to provide the correct visual alignment and allow unimpeded sight lines.Refer to USCG regulations for NM navigation lights for more information. A 24" B 1-7/8" C 2-1/2" Volts 12