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There is another review on here which highlights what a badly made and potentially dangerous (in fact not potentially - this IS dangerous) this so called smoke alarm is. I wish to add a second.
The Dicon SA900 Smoke Alarm is available in a lot of cheaper shops like Quality Save and Pound Stretcher but I actually bought it on Amazon which I do a lot of things, I paid £17.50 which I thought was fair for a smoke alarm, I mistakenly thought if I 'cheaped out' then I might get an inferior product.
The unit is really really easy to install (instructions are included), it has a 10 year warranty and a long life battery. You can tell that the battery is working because the red LED blinks every 45 seconds. It has a very sharp shrill alarm, and I was confident we were doing everything we could to stay safe.
Now, I didn't find out in too hard a way how wrong I was - luckily, I only set pasta on fire - the packet of dry spaghetti I had rolled onto my gas hob and set alight. Not too many flames but a helluva lot of smoke, which had me running back into the kitchen. It filled the house! My husband was worried that it hadn't triggered the smoke alarm so he checked it - to find the battery had leaked and the unit was totally broken and useless!
Obviously this was really worrying because I have a 13 month old baby and I bought the unit to keep my family safe. We have since had a mains operated alarm professionally installed. It really opened my eyes and I will never ever use one of these alarms again or recommend one to my friends and family. Given the experience I and the other reviewer had with the Dicon SA900 Smoke Alarm I think it is a dangerous and misleading item which should be banned from the shops.
I wish I could give this less than 1 star.