Cooling capacity is sufficient for occasional use, but very large condensation inside the box. What really bothered me was the extreme noise of the fan, which could be heard despite the car radio / music always - and the box was in the trunk. Sound not normal, more like a defective fan. Therefore, I have the box exchanged once at Amazon. However, the second box was just as loud as the first, so I've now also sent back and ordered me a higher quality box on the recommendation of a colleague. But also costs more than 3x as much ...