Kidde AC Plug-in Carbon Monoxide and Explosive Gas Detector Alarm | Nighthawk Sensor Technology | Model # KN-COEG-3

I'm about to wax poetic about the "Safety Siren Pro Series 1000" (or whatever demonic device this is). Let's be clear, this thing detects carbon monoxide like a bloodhound sniffs out a dropped hotdog at a picnic. No complaints there. If there's a rogue molecule of CO within a five-mile radius, this thing will know. It's like having a tiny, hyper-vigilant, gas-detecting chihuahua with a PhD in atmospheric chemistry. But, and this is a BIG but, when those batteries start to wane, oh. sweet merciful heavens... it's like a tiny, metal-clad demon has taken up residence in my home. The beeping... the BEEPING... isn't your standard, "Oh, batteries are low, please replace me" chirp. No, this is a sustained, high-pitched, soul-rending wail that sounds like a chorus of dying smoke detectors harmonizing with a dentist's drill. It starts subtly, a little "beep" here, a little "beep" there. You think, "Oh, I'll change them tomorrow." WRONG. You've just signed a pact with auditory torment. Within hours, it evolves into a relentless, rhythmic pulse of pure, unadulterated annoyance. My cat now hides under the sofa, my plants have visibly wilted, and I've started having flashbacks to that scene in Reefer Madness where the guy leaps out the window, convinced he's being chased by jazz demons. I swear, this thing is less a safety device and more a psychological warfare instrument. It's so effective at alerting you to low batteries that you'll replace them out of sheer, unbridled terror. You'll be sprinting to the store, batteries clutched in your trembling hands, like you're carrying the antidote to the apocalypse. Five stars for gas detection, minus a million for auditory assault. If you value your sanity, buy this thing, but keep a fresh pack of batteries on standby, and maybe invest in some industrial-grade earplugs. You've been warned.

Good CO detector, has 12v backup battery and 110 v plug in main power supply with a long (4’cord). This is a replacement for the first one I purchased 5 years ago. These units have a 5 year design life once they are plugged in. After 5 years of operation they automatically stop working and sound an alarm and message to replace the unit. I like the display, bright and legible red lettering and the alarm is loud enough for me to hear it upstairs even though it’s located in the basement. Yes, I will probably purchase again.

No complaints about this, but I have no way to really test its accuracy and sensitivity, so I have to take that part on faith. But the Kidde name warrants that faith. I do really like the device. MANY of these have a fixed AC plug on the back that requires one to place it at an outlet or to run an extension cord to the correct location for mounting. In our case, we are monitoring for natural gas, and that means the power source must be up near the ceiling. Of course, homes rarely have power outlets near the ceiling, and if they do, those are dedicated to TVs and such. So the only option is to run an extension cord or power strip to the proper location, mount that to the wall somehow, and then plug in the device into the power supply cord. That's ridiculous and unsightly. Those will work great for propane, but not for natural gas. The Kidde has a long (about 6'), low voltage extension cord attached to a conventional wall wart (transformer power supply) on the end that reaches down to a convenient outlet and feeds power to the device in a proper location reasonably near the ceiling. Installation is easy with the small "mollys" to hold adequately in sheetrock. The device is light enough that it doesn't take much to hold it securely. The LED display, which, I believe, is a continuous readout of CO levels, is large and bright enough to read from across the room. I've installed this primarily to monitor for natural gas leaks. Since moving in, we have removed THREE natural gas appliances: a gas range, a gas "fireplace" and a gas hot water heater. The only remaining gas appliance is the furnace. With a running furnace and three capped off gas spigots, this detector provides peace of mind about gas leaks. The CO detector is a bonus, and it's good to know that the furnace is properly vented and not leaking combustion byproducts. I'm pleased with this purchase, and I recommend it.

Year old, with a bad battery. I ordered and received the unit the same day. It was new old stock (NOS) made late 2024. Not idea. AND even worse, as soon as I plugged it in, the unit alarm started sounding with what looked like an "L6" error display. Turns out that was actually a "L" as in "Low" and "b" as in "battery". So I checked and indeed the shipped bat was low. I replaced it, after calming my family down about false alert, and the unit is now working properly. I'm ordering two more and will update this review if those two are newer and/or have good batteries.

Easy set up, nice to have, comes with a battery, peace of mind… I purchased another one