USCG (A16) certified for three mile visibility for Power & Sail vessels up to 65' (20 m). Completely sealed and waterproof. Tested and certified for electromagnetic interference. Long service life up to 20,000 hours. Low power consumption. Polycarbonate construction. 3.5" Diameter, 4" Height. Draw: 0.18-0.54A @ 12V DC. 3 Year warranty.