Now that we have a house in residential and thus several stories, it was important to me to also take care of our security. The price of the wireless detectors is low, which is why I was skeptical at first. I have all 5 interconnected and distributed in the house. I tested then via cigarette and it works. All five went off with a huge noise. I hope that I made to the Empty battery warning never have to hear from them ;-). Price / performance ratio in any case.
Short notice if someone wants to buy magnetic holder to. The detectors have a 9V battery and 3 AA Mignon and the radio module, meaning they are heavier and therefore not suitable for every magnetic holder. But Double-sided mounting tape holds well for a few years.
