It features charging indicator lights and enhanced ventilation and cooling to prevent overheating. It can be easily plugged into the vehicle cigarette socket and comes with a 1.8m cable. E-Mark certified for in-car use. Suitable for use with the following D20 batteries: 2.0Ah, 3.0Ah, 4.0Ah and 5.0Ah. D20 interchangeable battery system allows you to combine the same battery/batteries with any of the tools within the D20 series.