Two-mile, 360 Degree visibility, for boats up to 39.4 ft. (12 meter) in length. The articulating light simplifies installation. The 2-pin locking-collar pole allows installation in 95% of existing bases (Attwood & competitors). Articulating head adjusts 15 Degree fore or aft to fit all base angles. 9-watt wedge-base lamp. Anti-glare lens focus at the horizon and above, not in the driver ft. s eyes.