How to stop FireAngel smoke alarm from beeping (mains powered)
FireAngel ST-620Q Thermoptek Smoke Alarm with 10-year lifetime battery | DIY at B&Q
Why is my FireAngel Pro Connected smoke alarm beeping?
Linda W on Twitter: "@manchesterfire why is my fireangel smoke alarm making a static crackling noise? It's driving me nuts. #feellikephoebeinfriends" / Twitter