The AA 4.8W Car and Caravan Solar Battery Charger is designed to maintain the vehicle battery by converting light energy from the sun into electricity. The charger provides peace of mind that your vehicle will start if it has been left unused over a period of time. This product should not be left in place whilst driving. Ensure that the AA 4.8W Solar Battery Charger is kept dry and out of the rain. It maintains the 12V vehicle battery whilst the vehicle is parked and includes clips for direct battery connection. This charger is suitable for cars and caravans and is easy to install. Product Dimensions - L 44.00 x W 34.30 x H 1.70 cm.