Finally without blinking and "Battery is-empty-beep"

For some time I have smoke detectors in my house. The constant battery changes and the annoying flashing at night, what a nerve may well, if you just can not fall asleep, I was more tired. So I have got the set purchased here. My house is small, so I have given up the networking. According to the recommendation, I have attached in all rooms except kitchen and bathroom a smoke detector. That was just screwing with me, because I have planked with plasterboard ceilings. What I like very much:

- Test do not have little red button, but through thick button, which can easily be reached with the broomstick.
- No irregular flashing red LED
- Battery life 10 years after that smoke detectors have to be changed in accordance with the recommendation anyway. Tip: I have written on the bottom with permanent marker installation date. So I know later how long the battery has really kept ...

Haptic and from the installation produces the parts are still significantly higher quality than the typical low-Baumarkt devices. and to 10 years that is really not a big investment.
5 stars, found nothing to find fault.