I was looking for in an earlier publication by Stiftung Warentest for smoke detectors. And this found here. (EI Home 2105B). Now the parcel arrived and I was disappointed! What have now sent me for Billigkram? The smoke, which I had ordered was not round but square! Again, the test results were sought through, this time even more recent. Lo and behold, everything suuuuuper! One gets the current test winner (Jan. 2013) sent me the same price, according to the latest test results, and I have some EUR saved! Thank you, because you can probably not be more than satisfied! At any time recommendable!