--- product_id: 656034317 title: "Hardwired Smoke Detector, AA Battery Backup, Interconnectable, LED Warning Light Indicators, 4 Pack" brand: "kidde" price: "£110.27" currency: GBP in_stock: true reviews_count: 8 category: "Kidde" url: https://www.desertcart.co.uk/products/656034317-hardwired-smoke-detector-aa-battery-backup-interconnectable-led-warning-light store_origin: GB region: United Kingdom --- # 3 LED status indicators 85dB loud alarm Dual power: hardwired + AA backup Hardwired Smoke Detector, AA Battery Backup, Interconnectable, LED Warning Light Indicators, 4 Pack **Brand:** kidde **Price:** £110.27 **Availability:** ✅ In Stock ## Summary > 🔥 Stay ahead of danger with Kidde’s smart, interconnected smoke defense! 🚨 ## Quick Answers - **What is this?** Hardwired Smoke Detector, AA Battery Backup, Interconnectable, LED Warning Light Indicators, 4 Pack by kidde - **How much does it cost?** £110.27 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/656034317-hardwired-smoke-detector-aa-battery-backup-interconnectable-led-warning-light) ## Best For - kidde enthusiasts ## Why This Product - Trusted kidde brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Smart Sensing:** Advanced photoelectric sensor reduces false alarms from cooking, tested to latest UL 217 9th Edition standards. - • **Power Redundancy:** Hardwired 120V AC operation with 2 AA battery backup keeps protection active even during outages. - • **Unmissable Alerts:** Loud 85-decibel alarm with synchronized red LED flashes ensures you never miss a smoke warning. - • **Effortless Maintenance:** Self-testing with weekly manual test button and clear LED status lights for easy monitoring and peace of mind. - • **Seamless Interconnectivity:** When one alarm triggers, all alarms sound—maximizing safety across your entire home. ## Overview The Kidde Hardwired Smoke Detector 4-pack combines cutting-edge photoelectric sensing with reliable hardwired power and AA battery backup to ensure continuous fire safety. Featuring an 85-decibel alarm, interconnectivity for whole-home alerts, and intuitive LED indicators, this UL 217 9th Edition certified device minimizes false alarms and simplifies maintenance. Ideal for modern homes, it offers a decade of dependable protection with easy installation and weekly self-tests. ## Description Experience the next level of fire safety with the Kidde Hardwired Smoke Detector, AA Battery Backup, Interconnectable, LED Warning Light Indicators, 4 Pack, model 20SAR. This smoke detector has enhanced sensing technology that reduces false alarms often caused by cooking and sends fast alerts that help give your family more time to get out safely. Plus, it is interconnected so when one alarm sounds, they all do so you never miss an emergency (see user guide for compatibility with other Kidde models). This alarm offers a modern 5-inch design ideal for all living spaces such as living rooms, hallways, kitchens, & bedrooms. Comprehensively tested and designed to the latest UL standard for safety and reliability, the 5-inch smoke alarm is powered by 120V AC wiring with 2 AA alkaline replaceable backup batteries (included) for continual detection even during outages. Batteries should be replaced every 6 months. In addition, the detector is self-testing and easy to install with the included twist-and-click mounting bracket. Meets requirements of 9th Edition UL 217, FCC, and CSFM. Review: Good Choice - An established product that has been around for yeaars. The installation for me was easy as the wiring was the same and they were the exact same size as the old ones that were well past there prime. One of the things that I liked is that Kidde moved away from the 9 volt battery to 2 AA batteries. I always have plenty of those around. The only thing that I will have to get use to is the LED light is much brighter than the old Kiddes were. The Kiddes were more expensive than others offered by desertcart but for around 2.50 bucks a year per unit for 10 years, that is pretty cheap security. Review: The Good, the Bad, and the Ugly - This item was to replace the old ones that were already installed in my home. The Good These were very easy to install, but then again I already had other ones wired. The fit in the same receptacle, and seem to be good quality. Battery life doesn't really apply, since they are hardwired in my case. The Bad They work very well, now when I 'try' to cook and the kitchen fills with smoke they go off like crazy. The alarm is definitely loud enough. The Ugly The wiring in my house was actually not up to code. When I installed the final one I couldn't figure out why it was not behaving correctly. I am actually very glad I bought this multi pack because if I hadn't I never would have found the mistake the previous home owner had made when he wired the basement. ## Features - DETECTS SMOKE: Sounds a loud 85-decibel alarm when smoke is detected - 3 long beeps with red LED light flashing in time, repeating. - HARDWIRED & 2 AA BATTERY BACKUP (Included): Operates on 120V AC wiring (installed in the ceiling) with 2 AA alkaline batteries that provide battery backup coverage during power outages. - ENHANCED SENSING TECHNOLOGY: Reduces false alarms often caused by cooking. Comprehensively tested to meet the latest UL standards, meets UL 217 9th Edition & FCC standards. - SELF-TESTING ALARM: Internal components ensure alarm is always operating as expected. Not a substitute for a manual push test, perform a button test once per week to verify alarm operation. - INTERCONNECT CAPABILITY: When one alarm sounds, they all sound, so you can get out faster. (Different models offer different interconnection options and requirements. See User Guide for more info.) - 3 LED NOTIFICATIONS: LED lights indicate alarm status, green = normal operation, amber = operating error, red = smoke detected. - TEST & HUSH BUTTON: Makes it easy to test the 5-inch smoke detector and silence false alarms, should they occur. - 10-YEAR LIMITED WARRANTY: Warranty begins when the alarm is powered on. If that date is unknown, it should be assumed that alarms should be replaced. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0DDW98CGJ | | Alarm | Smoke Alarm | | Best Sellers Rank | #1,313 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #7 in Smoke Detectors & Fire Alarms | | Brand | Kidde | | Built-In Media | AA batteries, Four Alarms, Mounting Hardware, User Guide | | Color | White | | Customer Reviews | 4.3 4.3 out of 5 stars (926) | | Enclosure Material | Plastic | | Item Dimensions D x W x H | 1.88"D x 5"W x 5"H | | Item Type Name | Smoke Alarm | | Item Weight | 0.8 Pounds | | Manufacturer | Kidde | | Model Number | 20SAR | | Operating Humidity | up to 95% relative humidity (RH), non-condensing | | Power Source | Hardwired | | Product Style | 9th Edition | | Sensor Type | Photoelectric | | UPC | 047871328277 | | Unit Count | 4.0 Count | | Upper Temperature Rating | 100 Degrees Fahrenheit | ## Product Details - **Alarm:** Smoke Alarm - **Brand:** Kidde - **Color:** White - **Item Weight:** 0.8 Pounds - **Operating Humidity:** up to 95% relative humidity (RH), non-condensing - **Power Source:** Hardwired - **Product Dimensions:** 1.88"D x 5"W x 5"H - **Sensor Type:** Photoelectric - **Style:** 9th Edition - **Upper Temperature Rating:** 100 Degrees Fahrenheit ## Images ![Hardwired Smoke Detector, AA Battery Backup, Interconnectable, LED Warning Light Indicators, 4 Pack - Image 1](https://m.media-amazon.com/images/I/71rzOXtKNXL.jpg) ## Available Options This product comes in different **Pattern, Size, Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good Choice *by T***A on February 18, 2026* An established product that has been around for yeaars. The installation for me was easy as the wiring was the same and they were the exact same size as the old ones that were well past there prime. One of the things that I liked is that Kidde moved away from the 9 volt battery to 2 AA batteries. I always have plenty of those around. The only thing that I will have to get use to is the LED light is much brighter than the old Kiddes were. The Kiddes were more expensive than others offered by Amazon but for around 2.50 bucks a year per unit for 10 years, that is pretty cheap security. ### ⭐⭐⭐⭐⭐ The Good, the Bad, and the Ugly *by C***. on June 1, 2025* This item was to replace the old ones that were already installed in my home. The Good These were very easy to install, but then again I already had other ones wired. The fit in the same receptacle, and seem to be good quality. Battery life doesn't really apply, since they are hardwired in my case. The Bad They work very well, now when I 'try' to cook and the kitchen fills with smoke they go off like crazy. The alarm is definitely loud enough. The Ugly The wiring in my house was actually not up to code. When I installed the final one I couldn't figure out why it was not behaving correctly. I am actually very glad I bought this multi pack because if I hadn't I never would have found the mistake the previous home owner had made when he wired the basement. ### ⭐⭐⭐⭐⭐ Reliable Safety Upgrade! *by S***M on March 4, 2026* I recently replaced all my smoke detectors, which were over 15 years old, with the Kidde Hardwired Smoke Detector featuring AA Battery Backup. The installation was a breeze—swapping out the old units was straightforward, and the wiring was incredibly easy to manage. The additional LED warning light is a nice touch, providing an extra layer of reassurance. While I haven’t had to rely on them yet, I feel confident knowing they are in place and ready to alert me when needed. The product seems like an excellent investment in home safety. I’m looking forward to having reliable protection for years to come! ## Frequently Bought Together - Kidde Hardwired Smoke Detector, AA Battery Backup, Interconnectable, LED Warning Light Indicators, 4 Pack - Kidde Hardwired Smoke & Carbon Monoxide Detector, AA Battery Backup Smoke Alarm, Interconnectable, LED Warning Light Indicators, 2 Pack - Kidde Quick Connect Smoke Detector Adapter Plug, Smoke Alarm Wiring Harness, Compatible with Kidde Hardwired Smoke, Carbon Monoxide, & Combination Smoke & Carbon Monoxide Detectors --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/656034317-hardwired-smoke-detector-aa-battery-backup-interconnectable-led-warning-light](https://www.desertcart.co.uk/products/656034317-hardwired-smoke-detector-aa-battery-backup-interconnectable-led-warning-light) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-15*