Easy installation and foolproof operation!

Usual we attached As with smoke alarms, a relatively thin plastic frame on the ceiling, on which can be attached and remove it by turning it slightly to the smoke detector.
The installation went well with the enclosed plugs and screws and the smoke detector was hanging from the ceiling faster than you could believe.

The red LED flashes when properly assembled every 53 seconds, and so symbolizes the operability.
The battery is firmly installed, but since a battery life of 10 years (I could not test ;-)) is specified is that okay.
In addition allows the function by pressing and holding check the single key. This is acknowledged by the shrill beeping unmistakable.
You function in case of fire, I could not yet assess fortunately.

CONCLUSION
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Thus far only good features at a very fair price - therefore a strong buy recommendation! :-)