Micro crystalline cell solar panels in robust aluminium frame. Water resistant and robust durable construction for long life. Provides up to 5W of free solar power to maintain your battery. Ideal for seasonally used vehicles such as caravans, classic cars, motorcycles, golf trolleys, jet skis, motor homes or any vehicles which have been stood a long time without use 12V battery charging: Easy installation either through 12V DC power plug or using battery clips Polarity protection: Prevents damage if the clamps are connected to the incorrect battery poles Works best in direct sunlight but can work in sufficient daylight in overcast conditions. Supplied with 3m length cable, 12V DC power plug and battery clips