1 Year warranty The THINFILM technology allows a wider spectrum of natural light to be absorbed, meaning the unit can still generate electricity under low-light cloudy or winter conditions. This technology also enables the solar panel to handle the intense heat of the summer sun with little power loss due to the rising temperature. The AA Car Battery Solar Charger is only suitable for use on petrol cars from 2001 onwards and diesel cars from 2004 onwards. - Ideal for vehicles that are only occasionally used, or are only used for short journeys - It extends battery life by keeping the battery in a good state of charge through a trickle charge, topping up a 12v battery - Easy to install by plugging directly into the EOBD socket - Flashing blue LED light to indicate charge - .