After about 6 months was the first of 2 indicators made, in the form that he registered the movement and turned on, but never again ... well I switched him dead and then he went first again, but not for long, a two days. The same fate befell point number two, who was installed elsewhere in the house - both detectors switch 5 LED lights a 3 watts, which should provide it.
Unless bad for me, the seller contacted this ... wrote me mutatis mutandis quite friendly back that the detectors are older than 6 months and the evidence for defect would lie with me (true - there was something, we are living in Germany - and Warranty 12 months is, not everybody 12 months) ... then he wrote something about costs for checking, etc .... the part will cost 9 euros, actually I should have penetrated from the principle cause for distress with expert and all the trimmings ... the time was not worth it to me ...
This product is available also for 6.50 in better quality on Amazon and this seems to be stable, it has no longer this monstrous screw, but "normal" installation cable suitable contacts.