![Kidde Firex Smoke Detector, Hardwired with Battery Backup & Front-Load Battery Door, Smoke Alarm 21029877 - The Home Depot Kidde Firex Smoke Detector, Hardwired with Battery Backup & Front-Load Battery Door, Smoke Alarm 21029877 - The Home Depot](https://images.thdstatic.com/productImages/d7d550a0-5988-435d-8a62-382b5f3444e8/svn/kidde-hardwired-smoke-detectors-21029877-64_1000.jpg)
Kidde Firex Smoke Detector, Hardwired with Battery Backup & Front-Load Battery Door, Smoke Alarm 21029877 - The Home Depot
![Kidde Firex Hardwired Smoke Detector with Photoelectric Sensor and 9-Volt Battery Backup 21029883 - The Home Depot Kidde Firex Hardwired Smoke Detector with Photoelectric Sensor and 9-Volt Battery Backup 21029883 - The Home Depot](https://images.thdstatic.com/productImages/f33c3ab9-7144-4088-9633-9a40faf0a816/svn/kidde-hardwired-smoke-detectors-21029883-64_600.jpg)
Kidde Firex Hardwired Smoke Detector with Photoelectric Sensor and 9-Volt Battery Backup 21029883 - The Home Depot
![Kidde Firex KF10R Mains Powered Ionisation Smoke Alarm with Rechargeable Lithium Back-Up Battery | Safe Fire Direct Kidde Firex KF10R Mains Powered Ionisation Smoke Alarm with Rechargeable Lithium Back-Up Battery | Safe Fire Direct](https://www.safefiredirect.co.uk/media/catalog/product/cache/0c106f5d15bd9c3344a5e1e30a9f4859/1/0/10208_2nd.jpg)
Kidde Firex KF10R Mains Powered Ionisation Smoke Alarm with Rechargeable Lithium Back-Up Battery | Safe Fire Direct
![Hi, I'm going to attempt to replace these Firex smoke detectors myself. can I just buy the most recent model of these and swap them out, leaving all the old wires? Or Hi, I'm going to attempt to replace these Firex smoke detectors myself. can I just buy the most recent model of these and swap them out, leaving all the old wires? Or](https://preview.redd.it/hi-im-going-to-attempt-to-replace-these-firex-smoke-v0-7nce6mtqp4ba1.jpg?width=640&crop=smart&auto=webp&s=1340cfc628de58869043d20931c649b82fa77299)
Hi, I'm going to attempt to replace these Firex smoke detectors myself. can I just buy the most recent model of these and swap them out, leaving all the old wires? Or
![Kidde Firex KF20 Smoke Alarm (Mains / Battery Back Up- Optical) with SMK4896 Universal Mounting Pattress Plate : Amazon.co.uk: DIY & Tools Kidde Firex KF20 Smoke Alarm (Mains / Battery Back Up- Optical) with SMK4896 Universal Mounting Pattress Plate : Amazon.co.uk: DIY & Tools](https://m.media-amazon.com/images/I/71zU64leMeL.jpg)