Great for buoys, docks, moorings, or anything else that needs nighttime identification, this solar-powered light charges during the day and automatically turns on at dusk to alert boaters of hazards. Constructed with a tough, waterproof plastic housing (not submersible). Equipped with a "steady on" mode, slow flash (15 per min.), and fast flash (60 per min.) all in the same unit. 80-lumen output.