"Got one of these plus a 2 BRK smoke detectors mains / battery powered. Well made and reliable off a quality manufacturer. Safety is top of the list hence the upgrade to these alarms that will warn of any fire / heat issues 24hrs a day. Recommend 100% and will use these heat / smoke detectors again."
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Review 2 for BRK 680MBX Dicon Battery Back-Up Heat Alarm
"The large plug on the back of this thing means you have drill a large hole in your ceiling to fit it, and you can't fill it in afterwards. This might invalidate the fire rating of your ceiling. A recessed plug would make life much easier. This problem applies to other alarms in this series."