--- product_id: 680932785 title: "First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack" brand: "first alert" price: "15886 som" currency: KGS in_stock: true reviews_count: 5 category: "First Alert" url: https://www.desertcart.kg/products/680932785-first-alert-smi100-ac-hardwire-interconnect-smoke-alarm-with-battery store_origin: KG region: Kyrgyzstan --- # Hardwired with battery backup Interconnects all compatible alarms Quick Connect Plug for easy install First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack **Brand:** first alert **Price:** 15886 som **Availability:** βœ… In Stock ## Summary > πŸ”₯ Stay ahead of danger with smart, seamless smoke detection ⚑ ## Quick Answers - **What is this?** First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack by first alert - **How much does it cost?** 15886 som with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/products/680932785-first-alert-smi100-ac-hardwire-interconnect-smoke-alarm-with-battery) ## 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€’ **Trusted Reliability:** Solid build with 4.5-star rating and thousands of happy users - β€’ **Effortless Installation:** Quick Connect Plug means no rewiring headachesβ€”upgrade in minutes - β€’ **Power Outage Protection:** Battery backup keeps you protected even when the power goes out - β€’ **Precision Detection Tech:** Reduces false alarms from cooking smoke for uninterrupted peace of mind - β€’ **Whole-Home Early Warning:** Interconnect feature ensures every alarm sounds simultaneously for maximum safety ## Overview The First Alert SMI100-AC is a hardwired smoke alarm featuring advanced Precision Detection technology to minimize nuisance alarms, a battery backup for continuous protection during outages, and an interconnect system that triggers all compatible alarms simultaneously. Designed for easy installation with a Quick Connect Plug, it offers reliable, whole-home fire safety trusted by thousands. ## Description The First Alert SMI100-AC Hardwire Interconnect Smoke Alarm with Battery Backup meets new industry standards utilizing First Alert's Precision Detection advance sensing technology. This hardwire smoke alarm is easy to install and replace existing alarms with no need to rewire. Plus interconnect compatible alarms to create a whole home alarm system to help provide an early warning. Review: Great Smoke Detectors - I was able to replace 7 old Firex smoke detectors with these using an adapter. I had to buy the adapters separately on desertcart. These were very easy to replace. I just unscrewed the old screws (not all the way, just enough to take off old base plate). These base plates fit perfect on the existing screws, so just tighten then down. I attached the adapters to the existing wires and then to the new smoke detector, screwed the new detector onto base plate, pulled out battery pull tab, tested and good to go. I bought 12 detectors in June 2026 and they were all manufactured on May 15, 2026 so I had no issue with any being years old as others have said. All detectors tested good (loud alarm, interconnected with no issue) and have had no false alarms. Overall great purchase! Review: Good replacement alarm with simple install and battery backup - I got this as a replacement for an older hardwired smoke alarm, and it was pretty straightforward to swap in. The included quick connect plug made the setup easier, and it fit nicely once mounted. I also like that it has battery backup, so it still gives some peace of mind during a power outage. One thing I appreciated is that it is made to reduce nuisance alarms from normal cooking smoke, which is honestly a big deal if your old detector was too sensitive. The test/silence button is easy to reach, and the alarm feels solid, not flimsy or cheap. It also has the interconnect feature, so compatible alarms in the house can sound together. This is not a fancy smart unit, but for a dependable hardwired smoke alarm, it does the job well. Price felt fair, install was easy, and overall it seems like a solid upgrade from older builder-grade detectors. ## Features - First Alert's 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. - Through early warning interconnect, when one alarm sounds, all compatible alarms will sound - Battery backup provides continuous protection during power outages - Alarm indicator visually identifies the unit that initiated the alarm - Quick Connect Plug included allows for easy installation with no need to rewire ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0CJMN3443 | | Alarm | Smoke Alarm | | Best Sellers Rank | #179,930 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #185 in Smoke Alarms | | Brand | First Alert | | Built-In Media | Easy Adapter Plug, 9V Alkaline Battery | | Color | White | | Colour | White | | Customer Reviews | 4.5 out of 5 stars 1,904 Reviews | | Global Trade Identification Number | 10029054022469 | | Item Dimensions D x W x H | 14.2D x 14.2W x 2.5H centimeters | | Item Type Name | Smoke Alarm | | Item Weight | 0.6 Pounds | | Item weight | 0.6 Pounds | | Manufacturer | Resideo | | Mfr Part Number | SMI100-AC | | Model Number | SMI100-AC | | Number of Items | 1 | | Power Source | Battery Powered | | Power source | Battery Powered | | Product Style | Precision Detection | | Product dimensions | 14.2D x 14.2W x 2.5H centimeters | | Sensor Type | Ionization | | Style | Precision Detection | | UPC | 029054022462 | | Unit Count | 1 Count | ## Product Details - **Brand:** First Alert - **Colour:** White - **Power source:** Battery Powered - **Product dimensions:** 14.2D x 14.2W x 2.5H centimeters - **Style:** Precision Detection ## Images ![First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack - Image 1](https://m.media-amazon.com/images/I/61zYUADll+L.jpg) ![First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack - Image 2](https://m.media-amazon.com/images/I/81fhp53OaDL.jpg) ![First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack - Image 3](https://m.media-amazon.com/images/I/81KDJuyrITL.jpg) ![First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack - Image 4](https://m.media-amazon.com/images/I/716JVl6-z-L.jpg) ![First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack - Image 5](https://m.media-amazon.com/images/I/71D57xvrb1L.jpg) ## Available Options This product comes in different **Pattern, Size, Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great Smoke Detectors *by J***K on 5 July 2026* I was able to replace 7 old Firex smoke detectors with these using an adapter. I had to buy the adapters separately on Amazon. These were very easy to replace. I just unscrewed the old screws (not all the way, just enough to take off old base plate). These base plates fit perfect on the existing screws, so just tighten then down. I attached the adapters to the existing wires and then to the new smoke detector, screwed the new detector onto base plate, pulled out battery pull tab, tested and good to go. I bought 12 detectors in June 2026 and they were all manufactured on May 15, 2026 so I had no issue with any being years old as others have said. All detectors tested good (loud alarm, interconnected with no issue) and have had no false alarms. Overall great purchase! ### ⭐⭐⭐⭐⭐ Good replacement alarm with simple install and battery backup *by Y***N on 2 April 2026* I got this as a replacement for an older hardwired smoke alarm, and it was pretty straightforward to swap in. The included quick connect plug made the setup easier, and it fit nicely once mounted. I also like that it has battery backup, so it still gives some peace of mind during a power outage. One thing I appreciated is that it is made to reduce nuisance alarms from normal cooking smoke, which is honestly a big deal if your old detector was too sensitive. The test/silence button is easy to reach, and the alarm feels solid, not flimsy or cheap. It also has the interconnect feature, so compatible alarms in the house can sound together. This is not a fancy smart unit, but for a dependable hardwired smoke alarm, it does the job well. Price felt fair, install was easy, and overall it seems like a solid upgrade from older builder-grade detectors. ### ⭐⭐⭐⭐ Good smoke alarm, but always-on green light is too obnoxiously bright for the bedroom *by C***R on 10 July 2026* I bought several of these to replace decade-old Kidde smoke alarms. As far as I can tell, Amazon in the US market sells only three major brand options: Kidde (Firex), Siterwell, and First Alert. (Some outlets like Home Depot appear to sell other brands like Universal.) I bought these First Alert alarms for my apartment rental because they are fairly cheap but still get pretty high customer ratings for no-fuss dependability. I don't need or want expensive fancy alarms that I can hook up to my home internet or for which I had to create yet another corporate account, especially since I already have home security cameras. I didn't want to shell out a lot of money for a 10-year sealed battery because I don't know if I'll be staying in my rental that long. I did want fire alarms that met my city laws for rentals: hardwired with a battery backup, uses 9-volt batteries (because I had bought a bunch for the Kidde alarms), and interconnected (so that if a fire erupts in one area of my home, the rest of my home can be alerted as quickly as possible). Well, these First Alert alarms meet all those criteria. Installation was fine and easy, even though that was the first time I've dealt with wire nuts and figuring out my home's internal wiring. (Make sure to turn off your electricity at the circuit box!) Also, I used a permanent marker to mark how the + and - ends of the 9V battery should be put in, because you can't really see the plastic casing's markings. These alarms work fine. I don't do a whole lot of cooking on the stove, so I am also less concerned about false alarms. No issues so far in the past few days since installation, except for one problem. I am taking one star off because this alarm's always-on green LED light is insanely bright and impossible to dim with coverings on the outer casing alone (without defeating the alarm's operation). It's fine during the day, but at night in a bedroom, the piercing neon green light is so obnoxiously bright that it bothers me in my sleep. This LED light problem is apparently endemic to all smoke alarms, including all three major brands I listed, and I understand why this light cannot be turned off. However, these First Alert alarms have the additional feature that even if you cover the plastic casing's pinhole for the green light with electrical tape, the green light will leak out underneath and through all the other gaps -- which must remain open and uncovered (because that's how the alarm works, by detecting the smoke that reaches inside through the gaps). If that was some kind of a security feature, well it backfired because it forced me to take apart the plastic casing and put the black electrical tape directly over the green LED light bulb on the printed circuit board. (This is labeled "LED2" on the motherboard, while the red light is labeled "LED1".) Although you're not supposed to pry open the plastic casing to access the internal parts, doing this doesn't disrupt or damage the motherboard, so it went fine for me. However, I deliberately did not do a complete job of covering the green LED; I left the tape a little loose so that some light will leak out. You can see the result in the final photo -- you can still see a green light, but it is very faint in the dark. In total darkness, I can definitely see a green globe of light emanating from the alarm, but the brightness is tamped down enough that I can ignore it in my sleep. (It is so faint that it was impossible for me to take a photo of it with my smartphone.) So, overall, these First Alert smoke alarms seem like good, simple basic alarms for most areas of your home, but be aware that in a bedroom, the LED light could disrupt your sleep if left uncovered. ## Frequently Bought Together - First Alert SMI100-AC, 9120B Replacement Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack - First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup, 1-Pack - First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 6-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.kg/products/680932785-first-alert-smi100-ac-hardwire-interconnect-smoke-alarm-with-battery](https://www.desertcart.kg/products/680932785-first-alert-smi100-ac-hardwire-interconnect-smoke-alarm-with-battery) --- *Product available on Desertcart Kyrgyzstan* *Store origin: KG* *Last updated: 2026-09-09*