First Alert SMCO500V, Interconnect Battery-Operated Combination Smoke & Carbon Monoxide Alarm with Voice Alerts, 1-Pack
$51.99
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The First Alert SMCO500V Interconnect Battery-Operated Combination Smoke & Carbon Monoxide with Voice & Location Alerts helps provide an early warning and guide your escape to safety. Also equipped with First Alert’s Precision Detection advanced sensing technology that meets new industry standards.
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
Voice & location alerts tell you what the danger is and its location to help you escape safely
Battery-operated alarm is easy to install and maintain
Provides reliable 2-in-1 protection against both smoke and carbon monoxide
8 reviews for First Alert SMCO500V, Interconnect Battery-Operated Combination Smoke & Carbon Monoxide Alarm with Voice Alerts, 1-Pack
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$51.99
Ellen F –
Clear, reliable, and essential for home safety
This unit combines smoke and carbon monoxide detection in one device, which simplifies both the install and the long-term maintenance. It came with batteries, screws, and anchors — everything needed to mount it to the ceiling. Installation was straightforward and took just a few minutes.The voice alerts are clear and the test button is easy to use. It integrates with other First Alert units, so if one is triggered, the others will sound as well. That kind of system-level awareness makes a real difference.I bought this as part of a broader approach to home safety and preparedness. It’s not something I interact with often, but knowing it’s there and functioning properly adds peace of mind.This is a quiet, essential device that supports a safer, more intentional home.
Avexis –
Very Effective, Well Worth the Money
I have purchased a property that was lacking in the smoke alarm department and had no wireless interconnection and these were the first choice. They are very easy to pair and install. Fair warning though, they are loud. I wore my noise cancelling earbuds and even through those, I can clearly hear them. The quality is good, you can hear them clearly when they give the location of which one went off. These things are also very functional as I had unintentionally set them off less than a couple weeks of installation. They will save your life in a fire. I highly recommend getting these as they are worth the investment.
JW –
Awesome Interconnected Smoke & Carbon monoxide detector (battery unit) with voice
I’ve used previous iterations of this Battery operated (Wirelessly Interconnected) Smoke & Carbon Monoxide Detector (w/voice) in the past and this unit (SMCO500V) lives up to its predecessor.It’s simple to use and setup (provided instructions are read – to pair the units wirelessly to work together).- They’re Loud…but Not too loud – thankfully.- The mounts are a standard design to other smoke detectors (that can screw into the ceiling apparatus) and thus no new mounts were needed to attach these units in my home.- Battery-wise: If these units function like their predecessors – I’m sure it will last for several months on the eneloop AAs which I have been using for smoke detectors over the years.- Battery drawers are easy to pull open and get the batteries out. Simply push upwards from the bottom (of the battery drawer) to release and swap your batteries.- Haven’t experienced any false Alarms with these particular units yet…but will update this review if I do.- All in all, a good device that lives up to its predecessor 👍
El Kati –
Tested and Certified by Intertek with label on back of actual detector.
Intertek Testing Certification on back of each detector (photo). Pairing and assigning room name not too complicated but suggest using ear protectors. Installed 8 in large house and they all go off at once. Mounting plates are approx 4 7/8″, big enough to cover typical round ceiling box if needed (photo).More and more cities look for testing certification by UL or Intertek before passing permit inspections – even plumbing inspections. Both Intertek and UL have websites you can check to see if a particular product passed. I did not see any other interconnected detectors sold on Amazon (10/1/25) listed.If you’re going to trust a smoke alarm to wake up your family in time to get out safely, might as well install ones that are tested and certified. Otherwise, why bother putting them in at all?I took off 1 star because they don’t have enough rooms to choose from for voice notification feature.
Tim –
Worth buying
This was so easy to install and to link them together. Makes updating the detectors so simple. Now our home is up to code for our county.
Christian H. –
Good quality fire alarm with useful voice readout.
I use these in different rooms. One big advantage is that the other alarms say which alarm has been triggered in a voice readout so the source is more easily found.
NYreader –
False Alarms!
I don’t write many product reviews, but I want to warn other buyers who were maybe directed to this product by Wirecutter. Two major problems with this detector: it is extremely sensitive and was set off by steam from our shower. Fine, but after two months, it just started going off randomly. I had our local fire chief come and take a look and he said it was probably a bad detector. No chance for me to get a refund, either, after six months. Save your money!
sk customer –
Easy to set up. LOUD
We moved into a house with no smoke detectors and hardwire was not an option. We purchased 8 of these to cover, and at first read of the instructions it looked very daunting, but after a couple reads it became much more clear. The voice activation and being able to assign a room to the detector was a pro as it will notify all others when set off. Set up to interconnect was a breeze! I would recommend wearing hearing protection if you’re setting up multiple of these as they are LOUD! Which is great when you need them, but not necessarily during set up.