Convinced me completely

The smoke detectors make a quality impression and give me a sense of security. The handling is very easy.
They run with a 10-year battery, it must be held that no exchange, nor can. After 10 years of complete smoke detector with battery is exchanged.

Very loud alarm that can not be ignored (I find very important when you have a deep sleep).

For a false alarm can use the large push button, which can be operated with a walking stick etc from the ground, are switched off.

No disturbing LEDs so that even an operation in the bedroom is possible except for alarm.

This smoke alarm is a bit more expensive than models from the hardware store but I think 20 euros each should any of safe sleeping already be worth.