The quality of the molded plug / coupling is perfect. The cable has a kink protection and disconnect ridged surfaces for.
The cable is not suitable for outdoor use. Up here is explicitly stated. However, this is not because of the quality or the standard, but in the absence of grounding. This is outdoor duty, but not provided with a Euro plug. A device with Euro plug must not be operated outdoors. Should I still want to use such a device outside the line I would use without hesitation. Rates may be this Vorgen course not.
In any case, the extension cable is very high quality and not cheap extension Trippe from Wühlkorb.