The Nature PowerA(R) 1.5-watt Solar Battery Maintainer takes the sun's energy and turns it into electric current. This Solar Battery Charger also combats the effects of cold weather on your battery ensuring quick starts, even in the winter. A great alternative to traditional battery chargers since no AC power is required. Lightweight and portable Solar Battery Chargers Includes SAE cable, SAE battery clamps cable, 12V DC plug and 4 suction cups Built-in blocking diode to prevent reverse flow of electricity Weather resistant and works well in most lighting conditions Plug-and-play means it's ready to use Great for cars, boats, RVs, and most 12V rechargeable batteries