--- product_id: 24187174 title: "First Alert Smoke Alarm, Battery-Operated Detector with Test & Silence Button, SMI100, 1-Pack" brand: "first alert" price: "¥5631" currency: JPY in_stock: true reviews_count: 8 category: "First Alert" url: https://www.desertcart.jp/products/24187174-first-alert-smoke-alarm-battery-operated-detector-with-test-silence store_origin: JP region: Japan --- # Battery-operated for hassle-free install Precision Detection tech reduces false alarms Front-access battery compartment First Alert Smoke Alarm, Battery-Operated Detector with Test & Silence Button, SMI100, 1-Pack **Brand:** first alert **Price:** ¥5631 **Availability:** ✅ In Stock ## Summary > 🚨 Stay safe, stay savvy — smoke detection that works as hard as you do! ## Quick Answers - **What is this?** First Alert Smoke Alarm, Battery-Operated Detector with Test & Silence Button, SMI100, 1-Pack by first alert - **How much does it cost?** ¥5631 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/24187174-first-alert-smoke-alarm-battery-operated-detector-with-test-silence) ## 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 Alert:** Stay ahead of safety with timely reminders to replace your alarm before it’s too late. - • **Effortless Installation:** Battery-powered design means no wiring—mount in minutes and protect instantly. - • **Smart Sensing Technology:** Advanced Precision Detection cuts down nuisance alarms from cooking smoke, so you only get alerts that matter. - • **User-Friendly Maintenance:** Front-access battery compartment lets you swap batteries without uninstalling the unit. - • **Test & Silence at Your Fingertips:** Quickly verify functionality or silence false alarms with the easy-access button. ## Overview The First Alert SMI100 is a top-rated, battery-operated smoke alarm featuring advanced Precision Detection technology to minimize false alarms while providing early fire warnings. Its user-centric design includes a front-access battery compartment and a test/silence button for easy maintenance and reliable performance, making it a must-have for modern homes seeking hassle-free, dependable fire safety. ## Description The First Alert SMI100 Battery-Operated Smoke Alarm is equipped with First Alert's Precision Detection advanced sensing technology and meets new industry standards. This battery-operated smoke alarm is easy to install and the front access battery compartment makes for easy battery replacements. Review: Reliable Smoke Alarm That Was Quick and Easy to Install - I recently purchased the First Alert SMI100 smoke alarms and I’m really happy with them. Installation was incredibly easy since they are battery operated, so there was no wiring needed. I had both alarms mounted in just a few minutes. The design is simple and clean, and the front battery compartment makes it easy to change the battery without taking the whole unit down. I also like the test/silence button on the front because it makes testing the alarm quick and simple. The alarm itself is loud enough that you would definitely hear it throughout the house, which is exactly what you want for safety. The detectors use updated sensing technology designed to give early warning of fires while reducing nuisance alarms from things like cooking smoke.Overall, these smoke alarms give me peace of mind knowing my home has reliable protection. They were affordable, easy to install, and work exactly as expected. I would definitely recommend them to anyone looking for a simple and dependable smoke alarm. Review: Good product - Works great and is easy to put on the wall. ## 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. - Battery-operated alarm allows for easy installation and maintenance - Front access battery compartment makes for easy battery replacements - End-of-life warning lets you know when it’s time to replace the alarm - Test/silence button for efficient testing to ensure alarm is working properly ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0CJMP7WHH | | Alarm | Smoke Alarm | | Best Sellers Rank | #34 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Smoke Detectors & Fire Alarms | | Brand | First Alert | | Built-In Media | 9V Alkaline Battery | | Color | White | | Customer Reviews | 4.6 out of 5 stars 4,391 Reviews | | Item Dimensions D x W x H | 5.4"D x 5.4"W x 1.9"H | | Item Type Name | Smoke Alarm | | Item Weight | 0.7 Pounds | | Manufacturer | Resideo | | Model Number | SMI100 | | Number of Items | 1 | | Operating Humidity | 10-95% RH | | Power Source | Battery Powered | | Product Dimensions | 5.4"D x 5.4"W x 1.9"H | | Product Style | Precision Detection | | Sensor Type | Ionization | | Style | Precision Detection | | UPC | 029054022387 | | Unit Count | 1.0 Count | ## Product Details - **Brand:** First Alert - **Style:** Standard Detection - **Power Source:** Battery Powered - **Product Dimensions:** 2"D x 5"W x 5"H - **Item Weight:** 0.65 Pounds - **Alarm:** Audible - **Sensor Type:** photoelectric - **Global Trade Identification Number:** 00029054015518 - **Number of Items:** 1 - **Manufacturer:** First Alert ## Images ![First Alert Smoke Alarm, Battery-Operated Detector with Test & Silence Button, SMI100, 1-Pack - Image 1](https://m.media-amazon.com/images/I/61GUtvUotTL.jpg) ![First Alert Smoke Alarm, Battery-Operated Detector with Test & Silence Button, SMI100, 1-Pack - Image 2](https://m.media-amazon.com/images/I/81pp1qBrXjL.jpg) ![First Alert Smoke Alarm, Battery-Operated Detector with Test & Silence Button, SMI100, 1-Pack - Image 3](https://m.media-amazon.com/images/I/81cJazbFcNL.jpg) ![First Alert Smoke Alarm, Battery-Operated Detector with Test & Silence Button, SMI100, 1-Pack - Image 4](https://m.media-amazon.com/images/I/71Lu3Q9HVZL.jpg) ![First Alert Smoke Alarm, Battery-Operated Detector with Test & Silence Button, SMI100, 1-Pack - Image 5](https://m.media-amazon.com/images/I/71D57xvrb1L.jpg) ## Available Options This product comes in different **Pattern, Size, Style** options. ## 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 “smoldering 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 ### ⭐⭐⭐⭐⭐ Reliable Smoke Alarm That Was Quick and Easy to Install *by J***N on March 4, 2026* I recently purchased the First Alert SMI100 smoke alarms and I’m really happy with them. Installation was incredibly easy since they are battery operated, so there was no wiring needed. I had both alarms mounted in just a few minutes. The design is simple and clean, and the front battery compartment makes it easy to change the battery without taking the whole unit down. I also like the test/silence button on the front because it makes testing the alarm quick and simple. The alarm itself is loud enough that you would definitely hear it throughout the house, which is exactly what you want for safety. The detectors use updated sensing technology designed to give early warning of fires while reducing nuisance alarms from things like cooking smoke.Overall, these smoke alarms give me peace of mind knowing my home has reliable protection. They were affordable, easy to install, and work exactly as expected. I would definitely recommend them to anyone looking for a simple and dependable smoke alarm. ### ⭐⭐⭐⭐⭐ Good product *by B***L on May 15, 2026* Works great and is easy to put on the wall. ### ⭐⭐⭐⭐⭐ Great deal, easy replacement of old detectors *by B***M on May 29, 2026* Great price, good quality , easy installation to replace our old hard wired smoke detectors. ## Frequently Bought Together - FIRST ALERT Dual Sensor Smoke and Fire Alarm, SA3210 , White - First Alert CO605 Plug-In Carbon Monoxide Detector with Battery Backup , White - First Alert CO710 Carbon Monoxide Detector with 10-Year Battery and Digital Temperature Display , White --- ## 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.jp/products/24187174-first-alert-smoke-alarm-battery-operated-detector-with-test-silence](https://www.desertcart.jp/products/24187174-first-alert-smoke-alarm-battery-operated-detector-with-test-silence) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-07-04*