![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 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)
Kidde Firex KF20 Smoke Alarm (Mains / Battery Back Up- Optical) with SMK4896 Universal Mounting Pattress Plate : Amazon.co.uk: DIY & Tools
![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)