Two-mile, 360° visibility, for boats up to 39.4\' (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° 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\'s eyes.