![Universal Security Instruments USI-1204 Hardwired Ionization Smoke and Fire Alarm with Backup Battery Universal Security Instruments USI-1204 Hardwired Ionization Smoke and Fire Alarm with Backup Battery](https://www.universalsecurity.com/images/products/USI-1204/USI-1204.jpg)
Universal Security Instruments USI-1204 Hardwired Ionization Smoke and Fire Alarm with Backup Battery
![How to Replace Hardwired Smoke Detector – Safely Update Your Smoke Detectors with Kidde FireX - YouTube How to Replace Hardwired Smoke Detector – Safely Update Your Smoke Detectors with Kidde FireX - YouTube](https://i.ytimg.com/vi/ZAqqbQOidh8/maxresdefault.jpg)
How to Replace Hardwired Smoke Detector – Safely Update Your Smoke Detectors with Kidde FireX - YouTube
![First Alert BRK SC-9120B Hardwired Smoke and Carbon Monoxide Alarm with Battery Backup : Amazon.co.uk: DIY & Tools First Alert BRK SC-9120B Hardwired Smoke and Carbon Monoxide Alarm with Battery Backup : Amazon.co.uk: DIY & Tools](https://m.media-amazon.com/images/I/61qI7MQLwqL._AC_SY355_.jpg)
First Alert BRK SC-9120B Hardwired Smoke and Carbon Monoxide Alarm with Battery Backup : Amazon.co.uk: DIY & Tools
![Mains Powered Smoke Alarms & Heat Alarms with Self-Charging 10 Year Back-up Battery - Kidde Firex KF-R Series Mains Powered Smoke Alarms & Heat Alarms with Self-Charging 10 Year Back-up Battery - Kidde Firex KF-R Series](https://www.safelincs.co.uk/shopimages/products/high/kidde-firex-kf20-kf30-optical-heat-mains-alkaline-alarms-group.jpg)