--- product_id: 83301481 title: "First Alert SA320CN Dual Sensor Battery-Powered Smoke and Fire Alarm" brand: "first alert" price: "Β£4.90" currency: GBP in_stock: false reviews_count: 5 url: https://www.desertcart.co.uk/products/83301481-first-alert-sa320cn-dual-sensor-battery-powered-smoke-and-fire store_origin: GB region: United Kingdom --- # 85 dB loud alarm 2 AA batteries included Dual sensor tech First Alert SA320CN Dual Sensor Battery-Powered Smoke and Fire Alarm **Brand:** first alert **Price:** Β£4.90 **Availability:** ❌ Out of Stock ## Summary > πŸ”₯ Stay ahead of danger with dual-sensor fire detection! 🚨 ## Quick Answers - **What is this?** First Alert SA320CN Dual Sensor Battery-Powered Smoke and Fire Alarm by first alert - **How much does it cost?** Β£4.90 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/83301481-first-alert-sa320cn-dual-sensor-battery-powered-smoke-and-fire) ## Best For - first alert enthusiasts ## Why This Product - Trusted first alert brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Smart Alarm Logic:** Intelligent sensing reduces false alarms, so you only get alerted when it truly matters. - β€’ **Trusted Durability:** Backed by a 10-year warranty, this compact unit is built to protect your home long-term. - β€’ **Dual Sensor Precision:** Ionization + photoelectric sensors detect both flaming and smoldering fires for unmatched safety. - β€’ **Powerful Audible Warning:** 85 dB alarm ensures you hear it loud and clear, giving you ample time to act. - β€’ **Battery-Ready Convenience:** Operates on 2 AA batteries (included) for easy, wireless installation anywhere in your home. ## Overview The First Alert SA320CN is a compact, battery-powered smoke and fire alarm featuring dual ionization and photoelectric sensors for comprehensive fire detection. It operates on 2 AA batteries (included) and emits a loud 85 dB alarm to alert you promptly. Designed with intelligent sensing technology to minimize false alarms, it comes with a 10-year warranty, making it a reliable safety upgrade for any modern home. ## Description Utilizes both ionization and photoelectric smoke sensors for optimal performance ## Features - Utilizes both ionization and photoelectric smoke sensors for optimal performance - Intelligent sensing technology reduces non-emergency or nuisance alarms - Operates on 2 AA batteries (included) - Detects both flaming and smoldering fires with dual sensors - Emits a loud 85 dB alarm for ample warning - SA320FF designates SA320CN package in Frustration Free packaging with UN2911 labels for ion smoke alarms - Package Contents: 1 Piece Powered Smoke and Fire Alarm ## Technical Specifications | Specification | Value | |---------------|-------| | Alarm | Audible | | Asin | B00O8MVW0S | | Best Sellers Rank | #328,449 in Home Improvement (See Top 100 in Home Improvement) #1,068 in Home Security Alarms | | Brand | First Alert | | Built In Media | 1 Piece Powered Smoke and Fire Alarm | | Colour | White | | Customer Reviews | 4.5 4.5 out of 5 stars (3,285) 4.5 out of 5 stars | | Global Trade Identification Number | 00029054015358 | | Item Weight | 0.7 Pounds | | Manufacturer | Jarden Safety | | Manufacturer Warranty Description | 10 year warranty | | Mfr Part Number | SA320CN | | Model Number | SA320FF | | Power Source | Battery Powered | | Product Style | Compact | | Sensor Type | Photoelectric | | Unit Count | 1.0 Count | | Upc | 029054015358 | ## Product Details - **Alarm:** Audible - **Brand:** First Alert - **Colour:** White - **Global Trade Identification Number:** 00029054015358 - **Item Weight:** 318 g - **Manufacturer:** Jarden Safety - **Power Source:** Battery Powered - **Sensor Type:** Photoelectric - **Style:** Compact - **UPC:** 029054015358 ## Images ![First Alert SA320CN Dual Sensor Battery-Powered Smoke and Fire Alarm - Image 1](https://m.media-amazon.com/images/I/61MLRUElYzL.jpg) ![First Alert SA320CN Dual Sensor Battery-Powered Smoke and Fire Alarm - Image 2](https://m.media-amazon.com/images/I/71c-Nuno3bL.jpg) ![First Alert SA320CN Dual Sensor Battery-Powered Smoke and Fire Alarm - Image 3](https://m.media-amazon.com/images/I/61UrGM2NuhL.jpg) ![First Alert SA320CN Dual Sensor Battery-Powered Smoke and Fire Alarm - Image 4](https://m.media-amazon.com/images/I/71Ot79xzeVL.jpg) ![First Alert SA320CN Dual Sensor Battery-Powered Smoke and Fire Alarm - Image 5](https://m.media-amazon.com/images/I/51e1sYRVtTL.jpg) ## Questions & Answers **Q: I recently purchased three of these smoke alarms from Amazon. Can you tell me how high up on the wall the alarm should be installed as I do not want to install on ceiling. I specifically purchased these as they can be ceiling or wall mounted. Thanks.** A: The instructions that come with the unit duplicate what I have read from several Fire Department sources: you can place your unit on the ceiling, but AT LEAST 4 inches (10cm) from the wall. If you want to mount it on the wall, mount it MORE THAN 4 inches (10cm) BELOW the ceiling, but NO LOWER than12 inches (30cm) below the ceiling. It has to be high enough up the wall to "smell" the smoke, but that 4 x 4 inch (10cm x 10cm) area where the wall meets the ceiling can sometimes harbor a "dead zone" of still air where the smoke would NOT reach the detector quickly enough during a fire to warn you in time. Thus, do NOT mount your detectors too close to where the wall meets the ceiling. **Q: Is this detector a photoelectric or ionization type?** A: Please check with your local authority having jurisdiction. Also you can check with NFPA online. Ionization smoke alarms are generally more responsive to flaming fires. How they work: Ionization-type smoke alarms have a small amount of radioactive material between two electrically charged plates, which ionizes the air and causes current to flow between the plates. When smoke enters the chamber, it disrupts the flow of ions, thus reducing the flow of current and activating the alarm. Download this chart on ionization smoke alarms (PDF, 943 KB). Photoelectric smoke alarms are generally more responsive to fires that begin with a long period of smoldering (called β€œsmoldering fires”). How they work: Photoelectric-type alarms aim a light source into a sensing chamber at an angle away from the sensor. Smoke enters the chamber, reflecting light onto the light sensor; triggering the alarm. Download this chart on photoelectric smoke alarms (PDF, 782 KB). **Q: Does the unit beep to tell you that the battery is running low?** A: The beep is effective. It always seems to start in the middle of the night. I twist the unit off the ceiling and do a battery swap and have it back on the ceiling in less than a minute, craw back into bed before really waking up. It's not a pain to replace the batteries, it's very easy. Simply slide the tray out and pop new ones in. The batteries fit snuggly in the compartment and there are tabs that allow you to push the batteries out by applying pressure with your thumbs from the back side. There is an optional screw hole to make the battery compartment tamper resistant. This prevents people from easily taking the batteries to power their remote controls or whatever. When fire marshals inspect fire related deaths it's not uncommon to find the smoke and fire detectors had no batteries installed. This simple, optional, screw might seem like "a pain" to some people, but it's an easy way to save your life. This is a great unit. I have 6 in my house and I highly recommend them to everyone. **Q: 5 or 10 year warranty? Picture & Description say 10, Features says 5.** A: Package says 10 year limited warranty. It's cheap, easy to install. This is my second one. Had first one for 8 years. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Feels solid, battery pull out was easier to access than my old alarm, test worked great. everything you need for an easy mount *by on Reviewed in the United States 20 April 2018* Kind of hard to review something that hasnt saved your life yet...It feels like its made of quality materials especially compared to the 16 year old smoke alarm it will be replacing/working along side.I like the drawer pull out for battery replacement. But as I have arthritis in my hands I found it a little bit hard to get the drawer out and the batteries out. Went in easy enough. That being said it was a LOT easier putting in the two AA batteries than finagling the old alarm and its 9v battery compartment.Comes with everything you need to mount except the screw driver and drill if you like to pre-drill.I would purchase again. Test seemed to work. But only time will tell, as with any sensor/alarm when there is something for it to sense and go off about. I believe it was rated well in consumer reports but do not quote me. Always check for yourself as this varies by year.I got this one because my old one is a smoke alarm only and I wanted to have a dual sensor smoke detector fire alarm. no, sensing smoke is not the same thing as sensing a sudden flame up. Smoke is smoldering and a sudden flame up doesnt necessarily have smoke to set the alarm off. Plus learning my old alarm is 16 years old made me feel a little iffy. Apparently some smoke alarms are guaranteed for 25 years. Not sure about the new one. Newer ones seem to be good for 10 years rather than 25. But I feel safer knowing both the old and the new are on board.Maybe more than you wanted to know but I thought if you are like me and you did not know that there are two types of alarms regarding possible fire you might appreciate the TMI.Cheers! ### ⭐⭐⭐⭐⭐ Double A batteries! *by on Reviewed in Canada 20 June 2019* Works great but most importantly I don't have to buy 9 volt batteries anymore. ### ⭐⭐⭐⭐⭐ Good Choice for Bedroom *by on Reviewed in the United States 12 October 2016* There are some locations where you would want to know very quickly if there is a fire or even a hint of a fire brewing. The bedroom you sleep in is one such place. If you don't wake up immediately when there's a fire there, things are not going to turn out well. Because this First Alert SA320CN alarm detects both smoldering and flaming fires, you stand a good chance of getting everyone out of your house and calling the fire department.However you should not rely soley upon this alarm. You should have other alarms in several locations that are interconnected---when one sounds off, they all sound off. I keep a fire extinguisher near my bed----not so much to fight a fire elsewhere in the house, but rather to fight my way out of the house if necessary.The AA batteries on this alarm pull out of the unit at an angle; I marked the case with an arrow in order to help me remember this. I have been using Panasonic BK-3MCCA12BA eneloop AA 2100 Cycle Ni-MH Pre-Charged Rechargeable Batteries (Pack 12) in this alarm and all my other alarms. I shopped very carefully to find alarms that use AA and AAA batteries; I'm not a big fan of 9V batteries and I believe they are in the process of being phased out.This First Alert alarm comes with a pair of alkaline AA batteries, but runs perfectly well on precharged rechargeable AA NiMH batteries and never gives a low-battery-warning beep signal during the course of a year. I like to know that I can service all of my alarms each fall before the onset of the heating season---without running to the store and buying more batteries. If you decide to go with rechargeable batteries, be SURE and get the "precharged" type of NIMH batteries. These are also known as "slow discharge."This past year I also bought a Carbon Monoxide Alarm and two SABRE Wireless Water Leak Flood Alarm Sensor with 110 dB Siren - DIY EASY Installation for my basement and first floor laundry. ## Frequently Bought Together - First Alert SA320FF Dual-Sensor Smoke and Fire Alarm, Battery Powered, Frustration-Free Packaging, White , 1 Pack - First Alert CO605 Plug-In Carbon Monoxide Detector with Battery Backup , White - First Alert BRK 3120B Hardwired Photoelectric and Ionization Smoke Alarm with Battery Backup, Dual Sensing Smoke Alarm, 1-Pack --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/83301481-first-alert-sa320cn-dual-sensor-battery-powered-smoke-and-fire](https://www.desertcart.co.uk/products/83301481-first-alert-sa320cn-dual-sensor-battery-powered-smoke-and-fire) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-07-01*