I installed the unit a couple of weeks ago, so far no false alarms.
It is easy to fit it hooks onto two screws and looks smart and not intrusive.
Set up was straight forward, I tested the alarm which is quite loud.
A little green light flashes every 30 seconds to let you know it is operating.
The LED display gives a reading of zero when operating, and gives another reading when the alarm goes off.
Reading will have to be checked against the table in the instructions, of cause after everyone has vacated the premises and doors and windows opened.
A printed label telling you what to do if the alarm activates can be placed by unit.
Carbon monoxide is a silent killer, I really should have fitted one ages ago.
We sleep easier now we have one installed.
One other thing because it is battery operated it is also portable so you can take it with
you if you use a caravan or self catering cottages etc.
Hope this review helps.