Gulf Picasso , , Gulf Picasso. ProTechOne 4 AMP Corded ProMariner's ProTechOne Fully Automatic Onboard Battery Charger and Maintainer utilizes the latest in microprocessor and software control charging and energy saving auto maintain technology. Safe for short and long term storage with multi stage charging, conditioning, and auto maintaining proved to maximize battery performance and life. Designed for weatherproof applications and years of trouble free use, ProTechOne boasts a gasket molded case design for outdoor use with commercial grade jacketed AC and DC cables for maximum cable protection and durability. ProTechOne incorporates a push to test battery status monitor showing remaining battery power, in addition to fault detection of battery connections, reverse polarity, or battery too low to charge. In the event of a fault, both the Charging and Auto maintain LEDs will remain off. An angled easy to view LED dashboard provides the quick status of AC Power, Charge Mode, and Auto Maintain (Energy Saver) mode, which controls the charging output as needed to maintain a fully charged battery, lowering AC consumption and reducing operating cost. Features: All digital charging technology with fully automatic multi stage digital charging Dedicated battery charging, sensing, and control Push to test battery monitor LED fuel gauge status Waterproof DC safety fuse for maximum DC wire protection Ignition protected and FCC Class A for quiet operation and non radio interference