My ancient fire alarm which was given out free by our fire service eons ago has failed and I need a new one but I'm confused by the choices.
Can someone explain the differences, or point me to a website that does?
For instance, many of the devices for sale boast a "ten year battery guarantee" - what does that mean? Surely batteries can't last 10 years? And do I just get one (as I had previously in the hall)
, or one for each room?
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