--- product_id: 2215238 title: "First Alert SCO501CN-3ST Wireless Interconnected Combination Smoke and Carbon Monoxide Alarm with Voice Location, Battery Operated (pack of 1)" brand: "first alert" price: "18 zΕ‚" currency: PLN in_stock: false reviews_count: 3 url: https://www.desertcart.pl/products/2215238-first-alert-sco501cn-3st-wireless-interconnected-combination-smoke-and-carbon store_origin: PL region: Poland --- # Wireless interconnect up to 18 units 85 dB loud voice & siren alert Battery operated with EZ access drawer First Alert SCO501CN-3ST Wireless Interconnected Combination Smoke and Carbon Monoxide Alarm with Voice Location, Battery Operated (pack of 1) **Brand:** first alert **Price:** 18 zΕ‚ **Availability:** ❌ Out of Stock ## Summary > πŸ”₯ Stay ahead of danger with smart, wireless peace of mind πŸ“Ά ## Quick Answers - **What is this?** First Alert SCO501CN-3ST Wireless Interconnected Combination Smoke and Carbon Monoxide Alarm with Voice Location, Battery Operated (pack of 1) by first alert - **How much does it cost?** 18 zΕ‚ with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/2215238-first-alert-sco501cn-3st-wireless-interconnected-combination-smoke-and-carbon) ## 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 Legacy of Safety:** From the pioneers in home safety since 1958, backed by a 5-year warranty. - β€’ **Clear Voice Location Alerts:** Know exactly where danger strikes with programmable voice notifications. - β€’ **Seamless Wireless Safety Network:** Connect up to 18 alarms for whole-home protection without messy wiring. - β€’ **Effortless Installation & Maintenance:** Battery powered with easy-access drawerβ€”no ceiling removal needed. - β€’ **Photoelectric & Electrochemical Sensors:** Advanced dual-sensing tech reduces false alarms and detects deadly CO leaks. ## Overview The First Alert SCO501CN-3ST is a battery-operated combination smoke and carbon monoxide alarm featuring wireless interconnectivity with up to 18 units, an 85-decibel loud siren paired with clear voice location alerts, and advanced photoelectric and electrochemical sensors to minimize false alarms while maximizing safety. Designed for easy installation and maintenance, it offers a trusted 5-year warranty from a brand with over six decades of home safety expertise. ## Description Product Description The First Alert SCO501CN 3ST Combination Smoke and Carbon Monoxide Alarm with Voice Location detects both smoke and carbon monoxide in a single device. The alarm interconnects with up to 18 other First Alert enabled alarms in your home to create a wireless safety network. The photoelectric smoke sensor is designed to reduce false alarms from cooking smoke or shower steam while remaining sensitive to real danger. The advanced electrochemical CO sensor detects carbon monoxide leaks from multiple sources, including faulty fuel burning appliances. A loud 85 decibel siren and a voice alarm with 11 programmable locations indicate where and what the threat is. EZ access battery drawer, no need to remove alarm from ceiling to change battery. From the Manufacturer Keep your family safe from both fire and carbon monoxide poisoning with the First Alert ONELINK battery operated combination Smoke and Carbon Monoxide Alarm. ONELINK offers the same interconnected functionality as standard hardwired alarms without wires. The alarms communicate with each other and may provide an earlier warning of potential danger when people are in different locations in the home. The sooner you know, the sooner emergency responders can be notified, this may help reduce the potential loss of life and property damage. When compared to retrofitting an existing home, First Alert ONELINK costs much less than installing hardwired alarms in existing walls and/or ceilings. They are cost effective and easy to install. First Alert Exclusive voice alarm is programmable with up to eleven locations. Additional battery operated alarms may be added to create a wireless safety network. Photoelectric Smoke Sensing Technology reduces nuisance alarms and is environmentally friendlier. The Electrochemical Carbon Monoxide Sensor is the most accurate technology available. Comes complete with Test/Silence Button, Low Battery Warning, two AA Batteries and 5 year warranty. Review: Easy installation and setup...worked when kitchen got smoky - Update: A little cooking accident caused a lot of smoke (no fire). The nearest alarm went off properly, and all of the linked alarms went off as well. Silencing the alarm required holding down the silence button for five seconds or so, which silenced all of the linked alarms. This review is based ONLY on the installation and setup. I just installed 7 units. The installation is very easy...took me about 60 seconds per unit to install the mounting rings.. You'll need a Phillips head screwdriver and a drill with a 3/16 bit for the mounting holes. I'm pretty handy with tools, but there was nothing involved in this that a novice should have difficulty with. Follow the instructions for where they should be mounted. There is a "dead zone" where walls and ceilings meet. Smoke detectors are ineffective in that zone. The previous owner of my home mounted all of the old detectors right in the dead zone. Oops. The programming is easy IF you read the directions and follow them exactly. Women should do fine; men will probably have to try programming a couple times before they figure out which simple step they overlooked. (I got it on the second attempt.) If you are overdue for new bifocals like I am, you might need a magnifying glass. The programming took less than a minute per unit when I did it correctly. Use hearing protection while you are programming and and testing. Seriously. All of the units will be going off at the same time on the table in front of you. At 85 decibels each, it is extremely loud, My total project time for installing all 7 was about 45 minutes hour from opening the box to putting up my tools. My units are spread out over three levels of the house (one in the basement, two on the first floor, one in an upstairs hallway, and one in each of three bedrooms). No issues with them communicating with each other. I tested each one individually and made certain it was communicating with all the others just to be sure. Running up and down all the stairs 7 times was a good workout. Again, hearing protection is advised. I have no doubt we will all be awakened if we ever have a fire in middle of the night. I really like the voice feature. If I have an alarm I will not have to go running through the house to figure out where the problem is. It clearly enunciates which unit is going off. Hopefully I will never find out how they operate in an emergency. I will update if I have any operational issues. Review: Great product - just not the one that is advertised! - So I spent way too many hours trying to figure out what happened. We have several SCO501CN in our home that failed after several years and they worked so well, I wanted to replace each one of them. What we liked was: no false alarms, voice instead of crazy beeps when there is a problem, and interconnected. I ordered five from desertcart (desertcart.com as the seller) and was surprised to get an entirely different model. What was sent was the SCO500 which hardly appears anywhere on the internet. I did find it on First Alert's website however it wasn't clear that it was a voice model, which is what we really liked about the SCO501CN. The packaging also says nothing about voice. There is even a sticker with a bar code that says SCO 501CN on some of them, right below where the packaging clearly indicates that this is the SCO500...so weird. However, I opened one up and low and behold, it was voice, and CO, and smoke and interconnected, exactly what we wanted. It appears that the US has updated their requirements (UL STD 217) for smoke detectors due to the increasing number of lithium battery caused fires, and these models are consistent with this standard. So hopefully the new SCO500 works as well as the SCO501CN and thus far after a few weeks, no false alarms and they all installed easily (and into the same ceiling base as the old ones). Hopefully desertcart will update the listing for this at some point. I was told in November by their customer service that they would however still nothing yet. ## Features - The front cover design of the alarm may vary but product function remains the same. - Battery operated smoke and carbon monoxide alarm can be installed easily - Connects multiple alarms together for wireless safety network - Voice alarm gives clear indication of where the problem is located - Features photoelectric smoke sensor and electrochemical CO sensor - One button silences a false alarm and tests the unit. Loud 85 decibel alarm - NOTE: Kindly refer to the user manual provided as a PDF manual in the product description section - First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert Brand Trust Survey in February 2018) - Smoke particles of varying number and size are produced in all fires. For maximum protection, use both ionization and photoelectric sensing technologies. Ionization alarms are generally more sensitive to fast flaming fires and photoelectric alarms are generally more sensitive to smoldering fires ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000EVO7C2 | | Alarm | Audible | | Best Sellers Rank | #54,236 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #101 in Smoke & Carbon Monoxide Alarms | | Brand | First Alert | | Built-In Media | Smoke detector, batteries | | Color | White | | Customer Reviews | 4.5 4.5 out of 5 stars (2,630) | | Enclosure Material | FIRST ALERT SCO501CN-3ST ONELINK Battery-Operated Combination Smoke & Carbon Monoxide Alarm with | | Global Trade Identification Number | 00029054002457 | | Item Dimensions D x W x H | 2"D x 5"W x 5"H | | Item Weight | 3.2 ounces | | Manufacturer | First Alert | | Manufacturer Warranty Description | 7 Year | | Model Number | SCO500 | | Power Source | Battery Powered | | Product Style | Standard Detection | | Sensor Type | electrochemical,photoelectric | | UPC | 029054002457 | | Unit Count | 1.0 Count | ## Product Details - **Alarm:** Audible - **Brand:** First Alert - **Color:** White - **Global Trade Identification Number:** 00029054002457 - **Item Weight:** 3.2 ounces - **Material:** FIRST ALERT SCO501CN-3ST ONELINK Battery-Operated Combination Smoke & Carbon Monoxide Alarm with - **Power Source:** Battery Powered - **Product Dimensions:** 2"D x 5"W x 5"H - **Sensor Type:** electrochemical,photoelectric - **Style:** Standard Detection ## Images ![First Alert SCO501CN-3ST Wireless Interconnected Combination Smoke and Carbon Monoxide Alarm with Voice Location, Battery Operated (pack of 1) - Image 1](https://m.media-amazon.com/images/I/61e5TRDubdL.jpg) ![First Alert SCO501CN-3ST Wireless Interconnected Combination Smoke and Carbon Monoxide Alarm with Voice Location, Battery Operated (pack of 1) - Image 2](https://m.media-amazon.com/images/I/51s8KY2qHTL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Easy installation and setup...worked when kitchen got smoky *by S***M on January 13, 2014* Update: A little cooking accident caused a lot of smoke (no fire). The nearest alarm went off properly, and all of the linked alarms went off as well. Silencing the alarm required holding down the silence button for five seconds or so, which silenced all of the linked alarms. This review is based ONLY on the installation and setup. I just installed 7 units. The installation is very easy...took me about 60 seconds per unit to install the mounting rings.. You'll need a Phillips head screwdriver and a drill with a 3/16 bit for the mounting holes. I'm pretty handy with tools, but there was nothing involved in this that a novice should have difficulty with. Follow the instructions for where they should be mounted. There is a "dead zone" where walls and ceilings meet. Smoke detectors are ineffective in that zone. The previous owner of my home mounted all of the old detectors right in the dead zone. Oops. The programming is easy IF you read the directions and follow them exactly. Women should do fine; men will probably have to try programming a couple times before they figure out which simple step they overlooked. (I got it on the second attempt.) If you are overdue for new bifocals like I am, you might need a magnifying glass. The programming took less than a minute per unit when I did it correctly. Use hearing protection while you are programming and and testing. Seriously. All of the units will be going off at the same time on the table in front of you. At 85 decibels each, it is extremely loud, My total project time for installing all 7 was about 45 minutes hour from opening the box to putting up my tools. My units are spread out over three levels of the house (one in the basement, two on the first floor, one in an upstairs hallway, and one in each of three bedrooms). No issues with them communicating with each other. I tested each one individually and made certain it was communicating with all the others just to be sure. Running up and down all the stairs 7 times was a good workout. Again, hearing protection is advised. I have no doubt we will all be awakened if we ever have a fire in middle of the night. I really like the voice feature. If I have an alarm I will not have to go running through the house to figure out where the problem is. It clearly enunciates which unit is going off. Hopefully I will never find out how they operate in an emergency. I will update if I have any operational issues. ### ⭐⭐⭐⭐⭐ Great product - just not the one that is advertised! *by N***N on December 29, 2023* So I spent way too many hours trying to figure out what happened. We have several SCO501CN in our home that failed after several years and they worked so well, I wanted to replace each one of them. What we liked was: no false alarms, voice instead of crazy beeps when there is a problem, and interconnected. I ordered five from Amazon (Amazon.com as the seller) and was surprised to get an entirely different model. What was sent was the SCO500 which hardly appears anywhere on the internet. I did find it on First Alert's website however it wasn't clear that it was a voice model, which is what we really liked about the SCO501CN. The packaging also says nothing about voice. There is even a sticker with a bar code that says SCO 501CN on some of them, right below where the packaging clearly indicates that this is the SCO500...so weird. However, I opened one up and low and behold, it was voice, and CO, and smoke and interconnected, exactly what we wanted. It appears that the US has updated their requirements (UL STD 217) for smoke detectors due to the increasing number of lithium battery caused fires, and these models are consistent with this standard. So hopefully the new SCO500 works as well as the SCO501CN and thus far after a few weeks, no false alarms and they all installed easily (and into the same ceiling base as the old ones). Hopefully Amazon will update the listing for this at some point. I was told in November by their customer service that they would however still nothing yet. ### ⭐⭐⭐⭐⭐ Easy to install and connect to each other *by C***R on April 30, 2024* Our last house had hard-wired alarms which we had installed as part of a big remodel we did 20 yrs ago, 1 in each of 4 bedrooms, the hallway, the family room, the living room, and 2 in a very large home office/studio/work area. When we moved into our current place it had only 3 battery-powered alarms, 1 on each level, and I wanted the same reliability of connected alarms, but the cost of re-wiring was more than we could afford. I did some research and was hesitant about wirelessly-connected alarms at first, because the reviews didn't strike me as enthusiastic or that the alarms were reliable to the point of staking one's life on them. As time wore on my anxiety about having just the minimum number of alarms just nagged at me. I took a little gamble and ordered some of these. They were easy to install and easy to program. The also have a feature that lets you choose from a list of locations (that are common to most homes) to be spoken as part of the alarm, so you know the location/room of which alarm triggered the announcement. That's something even our hard-wired units didn't do. They use 2 AA batteries each, which are easy to replace simply be twisting/'unscrewing' the alarm unit from its' mounting plate. No screws must be unscrewed to replace the batteries, but they DO have a locking feature that is a plastic "pin" that comes as part of the unit and can make it difficult to open the battery compartment. You do NOT need to use it for the alarm to function, but it seems like something useful to landlords if renting out space. I did not use the pin to lock the battery compartment, as we're empty nesters and my spouse won't use a step stool yet alone a ladder. All mine are mounted on ceilings, so I need a step-stool/ladder to reach them, but they remove very easily. It's VERY unlikely anyone in our household is going to fiddle with the batteries. Know that the programming is a 2-step process when you are connecting more than 1 to the alarm "loop". The instructions were pretty easy to follow, and after connecting 2 or 3 units, you'll likely be able to do it without referencing them. NOTE THAT THE PROGRAMMING INSTRUCTIONS ARE ON A SEPARATE PAPER FROM THE INSTALLATION INSTRUCTIONS. The documentation states that each alarm unit should be within 100 feet of the next nearest unit, likely more than adequate for most homes. I installed 4 in August of '23, and now, more than 8 months later, have had no false alarms yet. I like them so much I ordered more for additional locations throughout the house. (I'm a heavy sleeper and also am hearing impaired and wanted to increase the likelihood of hearing any alarm). Note, too that YOU DO NOT NEED TO PROGRAM THEM FOR CONNECTIVITY, but if you don't, you might do better buying single units without the communication feature. Pricier than "single" units, yes, but if you want the extra protection of connected units and you need/want combination Smoke/CO2 alarms and can't/don't want to spend the money for hard-wired units, , I'd recommend these. ## Frequently Bought Together - FIRST ALERT SCO501CN-3ST Smoke and Carbon Monoxide Alarm, 120 V, White, Pack of 1 - FireAngel Carbon Monoxide Alarm and Detector - FA6813 10-Year Sensor Life CO Alarm for Home with AA Batteries - Travel, Portable Carbon Monoxide Detector - CO Detector Monitor with Test Button - FireAngel Combination Smoke and Carbon Monoxide Alarm for Home - SCB10-R, 10 Year Life, Dual Carbon Monoxide Detector and Smoke Alarm with Test and Hush Button - Combined CO and Fire Alarm - White --- ## 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.pl/products/2215238-first-alert-sco501cn-3st-wireless-interconnected-combination-smoke-and-carbon](https://www.desertcart.pl/products/2215238-first-alert-sco501cn-3st-wireless-interconnected-combination-smoke-and-carbon) --- *Product available on Desertcart Poland* *Store origin: PL* *Last updated: 2026-05-11*