Especially powerful for the Deaf or difficult of Listening to, particularly in situations exactly where Visible alarms may possibly go unnoticed. It’s essential that these sounders and Visible alarm gadgets are prominently marked with “Fireplace ALARM” for distinct identification. The sounder head ‘twists and clicks’ into The bottom on commissioning, https://www.firesense.co.uk/type/conventional-fire-system/conventional-sounders-vids-vads/