The Competition 7-Watt Amorphous 2 pack Solar Power 12-Volt Battery Charger helps keep batteries fully charged until your next use, This portable panel is great for keeping RVs, boats, cars and ATV batteries charged, The amorphous thin film solar panel technology maintains high performance even in cloudy, hazy and indirect light, Simple to install, just hook up the cables to your battery, It provides extra power and performance for all your charging needs, (Battery not included)