Thanks!
The adaptar is rather on the big side, but the price is OK, and the micro usb connector is a bit on the bigger side. Bought 5 and tested 1 so far.
The cable is also on the short side, would have been better to have at least 50% or more length, e.g. in my case these are being used for raspberry pi based security cameras, and in some cases the cable is simply too short.