Long shot but does anyone know what battery this alarm takes? My flat mate is out getting some and I can't check as I can't use our ladder without someone holding it. : r/firealarms
Deta 1163 Optical Smoke Alarm 240V with 9V Replaceable Battery Back Up (White) : Amazon.co.uk: DIY & Tools
uk - Does my smoke alarm battery need replacing? - Home Improvement Stack Exchange