Its easy to see how the NOCO Genius On-Board Marine Battery Charger earned its name. With industry-leading technology and cutting-edge yet practical features youll appreciate on every trip, these boat battery chargers stand head-and-shoulders above ordinary models. 100% waterproof with an IP68-certified rating for true weatherproofing, the Genius Chargers are ready for any environment. Rapid Charging Technology delivers 2-times-faster charging than traditional linear models. HF-HE Switch Mode ensures high-frequency, high-efficiency charging for a lightweight, compact charger with all power of bulky space-hoggers. Multiple Battery Chemistry adapts to Wet, Gel, MF, and AGM batteries. Protection against reverse polarity, short-circuits, open circuits, sparking, overheating, over current, and overcharging delivers total peace of mind. Gravity Optimization stabilizing charge pinpoints the specific gravity of a battery for peak performance. Recovery Mode recovers deeply discharge and sulfated batteries with special pulse charging. Abnormality protection, ignition protection, and fully interactive auto-adjust charging complete these NOCO chargers as the industrys best pound-for-pound performers. Available: 10A 1 Bank 20A 2 Bank 30A 3 Bank 40A 4 Bank Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Chargers.