It features a waterproof, shock and vibration-resistant construction, and its automatic temperature compensation delivers fast charging recovery, even in extreme conditions avoiding overcharging. This charger makes use of on-board mounting that eliminates the hassle of traditional portable chargers. Our digital on-board chargers are engineered with a micro-processor-based design to protect your battery, charge faster and help you stay on the water longer. Monitors temperature and state-of-charge. Enhanced status codes display charge stage, maintenance mode status, any error notifications and full charge. Automatic shut-off feature extends battery life by shutting down when charging is complete. Mounts conveniently in the battery compartment. MK 315D Features: Product # 1823155 On-board Battery Charger 15 Amps Total Output Convenient On-board Mounting Digitally-Controlled Microprocessor Design Protects Your Batteries so you can stay on the Water Longer Enhanced Status Codes (Charge Stage, Maintenance Mode Status, Error Notification & Full Charge) Up to 2X Faster Charging in High Temperatures Short Circuit, Reverse Polarity & Ignition Protection Saltwater Tested & Fully Corrosion Resistant Waterproof, Shock & Vibration-resistant Aluminum Construction Recovery Time: 10-12 hours Size: 12- " L x 7- " W x 4" H For use w/ 12, 24 or 36V system w/ 12V/6-cell Batteries That Are Flooded/Wet Cell, Maintenance Free or Starved Electrolyte (AGM) only (20-105 amp hour rating) FCC Compliant UL Listed to Marine Standard 1236 Includes: 1 Pre-Wired On-Board Marine Battery Charger 3 6' Fused Output Cable 1 6' AC Power Cord Installation Instructions Owners Manual