No more dead batteries! Use the power of the sun to maintain and prevent your 12- volt batteries from dying anywhere anytime. The Coleman 2 Watt Solar Battery Maintainer works in all lighting conditions even on cloudy days. Ideal for use with batteries of cars SUVs ATVs trucks and more. Maintenance free and easy to install. The solar panel easily mounts on the windshield with included suction cups. Made of durable ABS plastic and amorphous solar cells. Maximum power output: 2 Watts 133 mA.