Battery Doctor's(R) 5 Watt Solar Panel Trickle Charger - Maintainer Kit allows you to charge and maintain your RV, boat or cabin batteries using sustainable energy from the sun. This off-grid kit contains what you'll need to have power where and when you need it. WirthCo's Solar Charging Kit includes a 5 Watt solar panel, a male output adapter (cigarette lighter adapter), alligator clips, connectors and mounting hardware. | WirthCo 5 Watt Solar Panel Trickle Charger Maintainer