Ensure your vehicle's battery is always fully charged and healthy with Schumacher Electric's SP-400 4.8-Watt Amorphous Solar Battery Maintainer Two-Pack Bundle, powered by the limitless energy of the sun. These maintainers easily extend the battery life of 12-Volt lead-acid batteries and are perfect for use with motorcycles, snowmobiles, ATVs, boats, cars, trucks, RVs, and more. The SP-400 maintainers utilize amorphous solar technology, ensuring each works even in cloudy conditions. Additionally, the units are built with water resistance, making them durable enough to withstand a sudden rain shower. With two hookup options available, you can either connect the battery clips directly to your battery or use the 12V plug in your vehicle's DC accessory outlet. For extra overcharge protection, the Schumacher SPC-7A Charge Controller (sold separately) is highly recommended. Don't let a dead battery ruin your day, get the Schumacher Electric SP-400 two-pack bundle and enjoy the peace of mind that comes with a fully charged battery.