Cyclops 2 Watt/12 Volt Amorphous Solar Panel efficiently charges in all weather conditions including cloudy days. Maintenance free operation prevents natural drain of batteries over time. Maximum charge up to 2 watts / 100 mAh per hour; Plugs directly into your vehicle's 12V power socket; Specifications: 8.0" x 4.875" weighs less than 2 lbs; Kit includes: Solar panel w/5 ft. cable 12V DC adaptor 12V DC socket battery clamps extender cable and mounting hardware.