This Rectangular LED Transom Light is approved for USCG 2 NM (Colreg 2 mile). Constructed of corrosion resistant stamped 304 stainless steel. Installs with two #12 FH fasteners (included). 12 VDC. Does not include gasket. All USCG approved navigation lights must be mounted properly to provide the correct visual alignment and allow unimpeded sight lines. Please refer to USCG regulations for 1 NM and 2 NM navigation lights for more information.