BRK 660MBX and 670MBX Replacement Smoke Alarm - easichange SBBRKSM | DIY at B&Q
HNFD urges residents to check smoke alarms - South Santa Rosa News
Replacing the Battery in a BRK 670MBX Ionisation Smoke Alarm - YouTube
Identify Discontinued BRK 600 and 700 Series Smoke Alarms & Suitable Replacements - Safelincs
BRK 670MBX Ionisation Smoke Alarm, Mains Powered with 9 V Battery Backup : Amazon.co.uk: DIY & Tools
3 X BRK 670MBX Mains Smoke Alarm with 9V Battery Backup Replacement for DETA1111 £27.50 - PicClick UK
Need replacement smoke alarm. Current model (BRK 670MBX) discontinued. Do I *really* need to replace all (as per alarm manufacturer guidelines)? Can I not just wire up generic alarm to the circuit (