Seller contacted ... It states that there is no warranty for this type of product and if there was one that made more than 12 months.
Sold on Amazon.com, the support of this German company Red-Rey replied in English:
"The devices-have no warranty. Here ist Statutory legal warranty, is a thing qui que la proof product you buy is not defective When you get it. Aim it do not work for problems qui After a while come in. If you know what I mean . And After 6 month Normally you must show que la problem still there Was When You got the article.
Now its not feasible to fix the device. "
I conclude that the stew is to stay polite. With the shipping cost is 50 eur in the trash.
Do not buy. Or buy by saying that in less than 1 year it will fail.
I put a star because I am obliged to confirm your comment, and because he worked a few months.