Rugged rotary switch with black anodized faceplate showing 4 positions: off-Tricolor-Anchor-Strobe. Also includes rear PC board with terminal block for easy connections and built-in 2 amp fuse. Circuit board dimensions are 2.5 x 2.5 inches. Faceplate dimensions are 2.25" wide by 2.5" high. Simply connect incoming power to Batt+ and Batt- terminals, and the TriAnchor light wire black, brown, and blue to marked terminals.