Masthead Light 5nm Vertical Mount - Black HousingFeatures:LED (Light Emitting Diode) navigation light.Unique and precise definition of light angles.Rugged and unbreakable: Precision machined anodised aluminium housing protects the LED's and electronics.Completely waterproof and vibrationproof: Interior is fully filled and sealed with special potting resin.Waterproof to IP 68+ (submersible).Low power consumption - 70 to 90% less than traditional navigation lights.Full brightness with input voltages ranging from 10 to 32 Volts.All Lopolights have been tested several times during production, a total of more than 24 hours.Easy to install, adaptor and screws included (when applicable)