Universal Security InstrumentsMCND401 M Series Plug-In Carbon Monoxide and Natural Gas Alarm with 9-Volt Battery Backup

have had for 32 days, missed return window by 2 days. This one beeps after 30 minutes with the same CO2 warning of 061. Always the same number. Started on Sunday, the 30 day return window. Have another unit exactly the same make and model. They are plugged in outlets 4 feet apart and the 2nd unit does not have any warnings. For $70, think they should last more than 32 days.

Have had this Universal Monitor in use for the past 10 yrs and it has served its purpose. Twice it has alarmed when there was a problem that could have been dangerous situation. I highly recommend the use as it serves a double duty.

This company makes faulty detectors. I recently had one go off indicating a carbon monoxide leak. I immediately called the fire department and upon inspection of my home, I was told there was no leak and that the detector was faulty. I'm calling the company and demanding my money back. This is disgusting.Update: Company offered me replacements.... I blatantly responded to a reps email asking her why would I want more defective crap? I am now up at 1:30 AM because the 2nd one I bought started beeping. We didn't call the fire department but replaced it with a First Alert detector we had and so far, no beeping. This is unacceptable and I'm going to get to the bottom this somehow with reporting them to the proper authorities. This is insane.

this is direct replacement for our "timed out" piece, this is meeting the requirements of a CO, Natural Gas alarm. great shipping, product working

Wasn't able to trigger it by bagging it with pure carbon dioxide, so I am a little concerned that it might just be a pretty light. Shipped quickly. Battery lasting. As described.

Great item

We bought 4 of these, 1 for my house, 1 for my aunts house, 1 for my brothers house, and 1 for my moms house. Immediately the one in my aunts and brothers house started acting up, but i thought maybe they didn’t know how to start it up. Then my moms started going off yesterday, after being installed since March 2019, saying CO was present. I called our fire dept and they came out. They tested everywhere and said there is no CO. Then they looked at my moms detector and said it was junk. They said they get a lot of calls from people that buy these no name carbon monoxide detectors for them going off for no reason. I contacted the seller and they said they won’t return them since it’s been almost 4 months. I’m Im very disappointed.

Easy to use, reliable, sturdy.