2-mile, 360° visibility, for boats up to 39.4' 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° for or aft to fit all base angles. 9 watt wedge-base lamp. Anti-glare lights focus at the horizon and above, not in the drivers eyes.