It can be permanently attached to your 12-volt battery with 3/8-inch eyelet connections and integrated into X-Connect accessories for plug-and-play charging. High-efficiency LEDs blink to indicate the current charge status and draw almost no power from the battery. The battery charge level is displayed in 25% increments. Flat design for seamless installations with M10 (3/8-inch) hole size. Ultra-efficient design draws almost no power from the battery. More charging options with plug-and-play accessory swaps. Sturdy, waterproof connector for extreme environments.