Thanks for the reply Bill, got it out, see my other posting. Though never heard a click. It is also weird that Android does not recognize more usb stations than one. I had a USB 3.0 hub plugged in with two usb 3.0 micro sd card readers with a 32gb and a 64 gb card in it. In Windows I saw both mounted, in Android only one was visible, though one had to be formatted again in Android, but still did not appear in the Card reader together with the other one. But one micro sd card in the cardreader slot of the Chuwi and one in usb 3 station works alright.
Is it common, that Android 5.1 is not capable of mounting more usb stations than one?