It's important to select the right easichange® alarm to interchange your obsolete BRK types. The desk beneath will help you pick the proper substitution alarm. Please note which you can substitute your current BRK optical and ionisation alarms with an easichange optical alarm, on the other hand your BRK heat https://www.firesense.co.uk/type/conventional-fire-system/conventional-fire-alarm-control-panels/