Combo Smoke and Carbon Monoxide Detector Battery Operated with Digital Display, Combination Fire and Co Alam for Home& Kitchen

"We bought this carbon monoxide monitor and smoke detector as we are renovating an older house and have aging appliances not yet replaced.The alarm arrived in a timely manner and it was easy to install the back up battery. It came with good and easy to follow instructionsWe have had the unit for a few weeks now and it has constantly measured ""0"" (parts per million - ppm). Because the unit doesn't alarm for readings below 35 ppm, there is a button you can press to check if there have been any lower-level readings detected. Again, for us, when we checked through this function it also always read ""0"". We finally asked ourselves......does this unit even work?!!We are very happy with how the Contast CO detector works and are very glad to have it in our home - great peace of mind from a great product that we wouldn't hesitate to recommend to others."

Easy set up and great price. I went to home depot and they wanted $60 for the same product.

This is just what I was looking for. Does the job great and was very easy to hang. I burnt a roast and it went off. So it works for smoke....

Seems to be working great and I love the fact it lets you know when it’s low.I took it out by the exhaust of my pellet stove to test it and it works great. It also tells you at what level the co2 was so you can tell them at the hospitalso they know the best way to treat you.

This was a replacement for our old smoke detector in a camp trailer. After a friends family was nearly killed with a carbon leak, this is the perfect answer.

Love that the batteries were included

I purchased one of these detectors, sent it back for replacement as an exchange, and returned the exchange unit as well. Both units gave frequent false alarms, each time showing 051 or 052 ppm of CO. Concerned, I cross-checked the CO levels with four other CO detectors, none of which ever gave an alarm during this time. I entertained a visit from the fire department, who could find nothing higher than 008 ppm or so with their detector, even while this unit was giving alarms. I borrowed a professional Bacharach Monoxor II CO detector from a friend who does home inspections. In every case where one of these faulty detectors gave an alarm, I never saw levels of CO above 006 ppm, which is only 2 or 3 ppm above what I was reading outdoors. To make things worse, when I returned the second unit for credit instead of an exchange, Amazon issued me a credit of $0.00. So I paid $21.99, fought with two faulty detectors, and ended up without a working detector or the $21.99 I paid initially. This detector was to replace a Kidde detector, which had lost its mind a couple weeks earlier, giving false alarms and refusing to be silenced. This has definitely been an unpleasant experience, and calls into question the whole veracity of the CO detector industry. Maybe I'll buy a canary, like the coal miners did.

It's probably not a wise plan to buy the cheapest smoke/CO detector with an LCD out there, even if it is marked "Amazon's Choice." This one just isn't sufficiently reliable or trustworthy for a life-safety product. I tried this for a week and was particularly unimpressed by false alarms / nuisance trips.It sounds for no apparent reason. It woke me up in the middle of the night, twice, with instantaneous sharp beeps that did not persist, and for no apparent reason. In those cases, it displayed a 0 ppm indication, so it was clearly not claiming carbon monoxide, and there was no sign of smoke. (p.s.: there was no fire, my home and I are still around.) It also once reported a CO level (I think it was 43 ppm? Not sure, it woke me up in the middle of the night for that, too, and my memory was a bit imperfect and I didn't write it down). This seems consistent with the "Constant false alarms" review. The alarm memory feature did not seem to work right, although I don't have enough data to reliably say.It also came with minor scuff marks (circled in picture), not a good sign. A mysterious blue tool that is unexplained. It came with flat-head screws (with a mysterious waffle-pattern on the flat tops, see pic.) for countersunk mounting, despite the mounting plate having non-countersunk holes, so the screws should have been pan head (flat underside with a rounded top, not flat on top).The instructions could use some review from a native English speaker. Example: "If you leave home for long time and during the period the unit ever alarms, after you return [sic] and press the button for several seconds, green LED will flashes once every seconds and the peak alarm level will indicate on the LCD to alert you there is one CO alarm occurs."I would have ignored the minor stuff, but sounding in the middle of the night for no apparent, multiple times, is just not OK. Back it goes.