Harness the power of the sun to charge and maintain your automobile, boat, motorcycle, or power sports battery. The Schumacher Electric 12-Volt 5-Watt Portable Solar Battery Charger and Maintainer (SA1589) uses three built-in monocrystalline panels to convert sunlight into enough energy to trickle charge and maintain your 12-Volt batteries. You can even use solar panels to charge your USB devices through the 1A USB port. Featuring a maximum output of 5 watts, you’ll have more than enough off-grid power to keep your batteries fully charged and in optimum condition. The foldable solar charger also features built-in mounting grommets, a USB cable, a quick-connect cable, and heavy-duty battery clAmps.