they tried it in the winter, ran into a self-tapping screw with a press washer, pumped it up (it pumps quickly - in a minute - one and a half), drove to a tire fitting shop and put a patch. It does not pump a little, probably because of the sub-zero temperature - at 2.1 bar set, the device stopped at 1.9, I had to raise ~ 2.3 a little to get 2.1. there were fears that it could burn out with the engine running, but they did not come true - the device is in order!