"It sucks and blows the Heinzelmann, where mother can usually only suck ...." (Loriot) Blows like the devil, like a hair dryer - but ONLY VOLUME: it is built no pressing pressure, thus for boats and inflation tents unsuitable. After we found that we had to buy a second pump. I missed a clear indication of this simple fact. "Compressor" is compressing: just doing this volume pump fails.