SST-5304 Solar Car Battery Charger 1. This product is a solar trickle charger for 12V batteries, which helps to manage battery drain in all seasons. It prevents your car battery from becoming dead, which happens often when your car is left in the garage for weeks. 2. Suction cup available to attached the product to windshield of cars, for simply place the product on dash boards 3. Interchangeable connectors available: alligator battery clamp + cigarette lighter plug 4. Flashing red charging LED 5. Blocking diode to prevent reverse charging.