Fire alarms - domestic

Set of wirelessly interlinked 10 year battery fire alarms. 4 optical smoke alarms - for bedrooms/halls/living rooms. 1 heat alarm - for the kitchen where it won’t go off in response to steam or burnt toast. They have been interlinked so, if one detects a fire, they will all go off to ensure all occupants of the house are alerted. They will last until the end of 2035 without battery changes.