Haha may be, but it was just 14 EUR so I was ok taking the risk, especially because in theory you only need the app for the first setup, after that it should work offline as far as I understand. But it's difficult to understand how to get it working, the app can't find it and the littli instruction paper which came with it is in Chinese, so I'm still searching the internet on how to get it working.

But actually I have had often good luck with such chinese periferials, they do cost 1/10 of the price and I got everything working yet and everything offline unlike the stuff you can buy in europe.