--- product_id: 609937868 title: "First Alert SMI105-AC, Interconnect Hardwire Smoke Alarm with 10-Year Battery Backup, 1-Pack" brand: "first alert" price: "252.38 DT" currency: TND in_stock: true reviews_count: 8 category: "First Alert" url: https://www.desertcart.tn/products/609937868-first-alert-smi105-ac-interconnect-hardwire-smoke-alarm-with-10 store_origin: TN region: Tunisia --- # Hardwired with battery backup Interconnects multiple alarms 10-year battery backup First Alert SMI105-AC, Interconnect Hardwire Smoke Alarm with 10-Year Battery Backup, 1-Pack **Brand:** first alert **Price:** 252.38 DT **Availability:** ✅ In Stock ## Summary > 🔥 Stay ahead of danger with 10 years of worry-free protection! 🔋 ## Quick Answers - **What is this?** First Alert SMI105-AC, Interconnect Hardwire Smoke Alarm with 10-Year Battery Backup, 1-Pack by first alert - **How much does it cost?** 252.38 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/609937868-first-alert-smi105-ac-interconnect-hardwire-smoke-alarm-with-10) ## 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 - • **End-of-Life Indicator:** Smart alert tells you exactly when it’s time to replace, so you’re never caught off guard. - • **10-Year Battery Backup:** Continuous protection even during power outages—set it and forget it for a decade. - • **Precision Detection Tech:** Advanced sensing reduces false alarms from cooking, so you only get alerts that matter. - • **Whole-Home Early Warning:** Interconnect multiple alarms so when one sounds, all do—maximizing your family’s safety. - • **Easy Replacement & Installation:** Fits existing First Alert mounts and connectors for a hassle-free upgrade. ## Overview The First Alert SMI105-AC is a hardwired smoke alarm featuring Precision Detection technology that minimizes false alarms, a 10-year battery backup for uninterrupted safety, and interconnect capability to alert your entire home simultaneously. Designed for easy replacement with existing First Alert mounts, it includes an end-of-life warning to ensure timely updates, making it a reliable, long-term fire safety solution. ## Description The First Alert SMI105-AC Interconnect Hardwire Smoke Alarm with 10-Year Battery Backup uses First Alert's Precision Detection advanced sensing technology and meets new industry standards. Interconnect multiple alarms together to help provide an early warning throughout your whole home and have peace of mind knowing the 10-year battery backup provides continuous protection in the event of a power outage. Review: Simple replacement for First Alert smoke detectors that have expired - Built in long life battery means no need to replace and no need to try to shut up annoying chirping of dying battery at inconvenient hours. Unit fits plug in connector and bracket of older units. Meaning replacement installation is simple: twist off old one, pull electrical connector off old one, plug connector into same spot on replacement and twist on new one into original wall/ceiling bracket. Then pull out plastic battery tab to connect battery and activate unit. Multipacks are economical way to replace all units at once. Theoretically, units have a ten year life. Replacing all units at same time is easier than tracking life of individual units and ensures all are within operational window. Review: Nice units and look great - Easy to install. Make power is off before you begin. Remove old detector but leave the screws annd use those to attach the new one to the electrical box. If you need to use the included adapter go ahead and connect the white to white, black to black and orange to red. Then just connect the adapter to the new detector. Be sure to remove the clear plastic strip to activate the battery. NOTE. You don’t need to connect the orange to red if the detector is not going to be connected to communicate with other detectors. ## Features - First Alerts Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency. - 10-Year battery backup provides continuous protection during power outages - Through early warning interconnect, when one alarm sounds, all compatible - Alarm indicator visually identifies the unit that initiated the alarm - End-of-life warning lets you know when it’s time to replace the alarm ## Technical Specifications | Specification | Value | |---------------|-------| | Alarm | Smoke | | Brand | First Alert | | Color | White | | Power Source | Battery Powered | | Product Dimensions | 5.6"D x 5.6"W x 2"H | | Style | Precision Detection | ## Product Details - **Alarm:** Smoke - **Brand:** First Alert - **Color:** White - **Item Weight:** 0.7 Pounds - **Number of Items:** 1 - **Operating Humidity:** 10-95% RH - **Power Source:** Battery Powered - **Product Dimensions:** 5.6"D x 5.6"W x 2"H - **Sensor Type:** Ionization - **Style:** Precision Detection ## Images ![First Alert SMI105-AC, Interconnect Hardwire Smoke Alarm with 10-Year Battery Backup, 1-Pack - Image 1](https://m.media-amazon.com/images/I/71yErRIjxzL.jpg) ## Available Options This product comes in different **Pattern, Size, Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Simple replacement for First Alert smoke detectors that have expired *by P***Z on February 25, 2026* Built in long life battery means no need to replace and no need to try to shut up annoying chirping of dying battery at inconvenient hours. Unit fits plug in connector and bracket of older units. Meaning replacement installation is simple: twist off old one, pull electrical connector off old one, plug connector into same spot on replacement and twist on new one into original wall/ceiling bracket. Then pull out plastic battery tab to connect battery and activate unit. Multipacks are economical way to replace all units at once. Theoretically, units have a ten year life. Replacing all units at same time is easier than tracking life of individual units and ensures all are within operational window. ### ⭐⭐⭐⭐⭐ Nice units and look great *by J***N on January 17, 2026* Easy to install. Make power is off before you begin. Remove old detector but leave the screws annd use those to attach the new one to the electrical box. If you need to use the included adapter go ahead and connect the white to white, black to black and orange to red. Then just connect the adapter to the new detector. Be sure to remove the clear plastic strip to activate the battery. NOTE. You don’t need to connect the orange to red if the detector is not going to be connected to communicate with other detectors. ### ⭐⭐⭐⭐⭐ Works Great — Once You Actually Install It (According to My Wife, 3 Months Late) *by A***S on August 23, 2025* Bought this smoke detector because, you know, fire safety is important… Apparently not important enough for me to install it in under 90 days. But hey — I had other things to do. Like reorganize the garage. Twice. And stare at it in the box on the kitchen counter like it was going to mount itself. Meanwhile, my wife spent three months walking past it like she was in a house made of dry hay and open flames. Every time the oven turned on, I got the look. You know the one — the “If the toaster sparks, we’re done” look. ⸻ 🔥 Smoke Detector Functionality Once I finally summoned the courage (and a step stool), this thing installed easily and worked like a champ. Tested it with the “toast test” and yep — she’s got lungs. Loud enough to wake the neighbors, the pets, and possibly the dead. I feel safer already. So does my marriage. ⸻ 💵 Value for Money Excellent. A small price to pay for not living in a potential fireball and regaining my wife’s trust. Honestly, I should’ve paid more just for the emotional damage I caused by procrastinating. ⸻ 🧰 Quality & Build Solid construction. Doesn’t feel cheap or flimsy. You can tell it’s built to detect danger, not just hang out on the ceiling for decoration. ⸻ 🔄 Ease of Replacement Swapping it in for the old detector was fast and painless. If only me actually doing it had been that easy. Seriously, it took longer to unwrap it than to install it — once I finally picked up a screwdriver. ⸻ 🧯 Final Thoughts: • Yes, it works great. • Yes, it’s loud, reliable, and makes us feel safe. • No, I can’t explain why it took me a whole fiscal quarter to install it. Wife’s happy. House didn’t burn down. Marriage survived. 10/10 would delay installation again (kidding, honey). ## Frequently Bought Together - First Alert SMI105-AC, Interconnect Hardwire Smoke Alarm with 10-Year Battery Backup, 1-Pack - First Alert SMICO105-AC, Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with 10-Year Battery Backup, 3-Pack - First Alert Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector with Battery Backup, SMICO100-AC, 1-Pack --- ## 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.tn/products/609937868-first-alert-smi105-ac-interconnect-hardwire-smoke-alarm-with-10](https://www.desertcart.tn/products/609937868-first-alert-smi105-ac-interconnect-hardwire-smoke-alarm-with-10) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-06-20*