Sunforce (50104) 4W 12V Solar Battery Trickle Charger...

High efficiency Amorphous solar panel operates in all lighting conditions, even on cloudy days. The OBD II connector allows the solar panel to connect to the onboard diagnostics port in most modern vehicles for quick, safe and convenient battery charging. The panel can also easily connect to a vehicle’s 12 volt battery with battery clamps and 12 volt DC plug.

Bypass diode minimizes power drop during shade
Shatterproof tempered glass for superior durability
Easy to install and maintenance free
Includes: 12 Volt DC plug, alligator battery clamps, suction cups to easily mount the solar panel to the vehicle’s windshield and OBD II connector
No main power or wiring required