... But that's not the purpose of such a review. You could also wait for it wis somewhere burns where such a smoke detector depends, and then evaluate it in its actual function. This is within the framework of this product evaluation but also not. So maybe this: I have the equipment unpacked, reingesteckt batteries attached (albeit with silicone adhesive to the concrete floor, not with the supplied plugs and screws). Now they do what they should do, according to the functional description, namely flash twice briefly at the minute, and signalieren click of a button, the battery is not yet empty. The procured for two rooms to compare higher-priced mumbi RM202 does the way nothing else. I am satisfied, and rely on the official certification mark in the event that there are times but irgemndwann to report smoke.