"Bought 2 of these. Only just fitted them so can`t comment too much on reliability but similar ones in the past have been good. The opening part to get at the battery was a little stiff and on closing it thought that it may snap a part of the plastic - it didn`t. As the battery is meant to last a year, no problem."
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Review 7 for First Alert SA200BUK-X5 Ionisation Smoke Alarm