Carbon Monoxide Detector, HECOPRO Digital Display Carbon Monoxide Alarm, Electronic Equipment, Power Detection Equipment, Alarm Clock Warning, Comply with UL2034

Inexpensive enough to have one in every room. Although I cannot speak for the battery life as yet, so far it's able to display the current CO level whenever pressing the test button. The display lights up as well when it's alarming, which is nice. I will update if the battery life does not meet at least 90 days (I know that CO monitoring is power hungry so I would reasonably expect to have to change the batteries every 3 months or so) But for the price it's a great value. No false alarms as yet. To test it, I actually did hang it in a tool shed and pointed the exhaust of a running generator into the shed, and it did alarm after about 15 minutes and it lit the backlight and displayed the level of CO detected. So I DO feel confident that it DOES work to alert me of the presence of unsafe levels of CO (though I don't have another meter to compare it to for accuracy of the displayed CO level.) I shut down the generator and placed a fan in the door to air out the shed and it reset itself once the levels were back down to safe levels again. Very happy with it so far!

This Carbon Monoxide detector arrives in a well packaged, compact box with easy to read full instructions on a quick and easy installation. All hardware needed is included as well. All you need to install it is simple tools.The peace of mind we get from having this Carbon Monoxide detector is invaluable, and yet it was very inexpensive.Thank you,Mr. & Mrs. "Jr."

My old CO2 Monitor reached its end of life. I needed a new CO2 monitor andI needed it fast. I searched both eBay and Amazon and this was One of the most economical CO2 monitors I could find. Not only that but it was available for delivery next day. I received it today, simply loaded it with 3 AA batteries and put it on the wall. It works perfect and actually has a brighter nicer display than my old one that cost twice as much. best overall value, fast free delivery, easy to install. 100% satisfied!

Better to have this just in case. Easy to install seems to work well

What I liked most what that there is a digital reading of the CO2 level. Very easy to install, gives me peace of mind to know the CO2 is being monitored.

Received this carbon monoxide alarm quickly and on time. Easily installed batteries and mounted unit. The alarm sound is very loud which I think is great! I won't be sleeping through this alarm should it need to go off. Working great for the few weeks I have used it.

Arrived in perfect condition. Easy to unscrew and install 3 AA batteries (not included). Hit the test button, it beeped twice. Seems fine. Hung it up. Easy and done!

Simple as can be. Load the batteries; watch for blinking green light which indicates the unit is working as intended.

This is a good CO detector. I like that its AA powered so I can put it anywhere, I also always have AA batteries.