4 Pack Combination Smoke and Carbon Monoxide Detector Battery Operated, Travel Portable Photoelectric Fire&Co Alarm for Home, Kitchen

As the title says, these duel smoke/C0 detectors work well and are very loud!! I'm a Firefighter and have access to a C0 and smoke testing machine. I tested all 3 of mine and they alerted at the lower end of the minimal settings for C0 & with the smoke emitter set to low, they all went off as soon as the test smoke reached the sensors. They're very easy to install and comes with everything you need, including 9V batteries (Remember to change them when you change your clocks. Or every 6 months). Mount them at minimum 4- 6 inches away from walls or ceilings, 12 inches maximum!!! If possible, dead center at the top of basement stair landings and also the center of each cieling at the top of each floor stair-way if possible to avoid "clean air pockets" that develop as heat causes smoke to "roll" upon reaching the top of the stairs or any cieling surface. (That's why mounting them 4 to 6 inches away from walls and cielings is si important). They have a test button, be sure to test them when you're dusting or every few weeks or so. If it "chirps" every few minutes, that means it's time for new batteries. This 3 pack is perfect for most house inspections so the price, the quantity and quality make them perfect for sellers to insure they pass their fire inspection and having the Carbon monoxide alarm feature is needed in some states/towns so this kit has you covered all around.

Easy to install, has extra hardware for installation and came with batteries, which is a nice touch. Good and loud! Has an occasional green light blip so you know it's monitoring. Seems like a great deal for both smoke and CO monitoring.

Great deal for a great product and very necessary for safety at home.

We put these in each of our bedrooms

Ordered a 4 pack and had to throw 2 of them away after only a few months of use because they would randomly go off. No apparent reason, I suspect it’s just poorly made. Too many false alarms, save your money. Unless you like waking up in the middle of the night thinking your house is on fire, otherwise I would not recommend.

Bought these to add more safety and security to our home. Our original smoke detector died so I tried this pack. I am impressed so far. They seem to be working just as well as other ones I’ve seen. These are good quality and best yet, they detect smoke and carbon monoxide giving a feeling of security.

The alarms That we got were great at the beginning but after six months, we have one that keeps beeping so we bought new batteries and it’ll last for a day And then start beeping again. I think maybe the alarm itself is not working and it’s not good especially if these are for emergencies

One of the detectors kept going off. I had it next to another one that was fine. I reset it and it continued to go off. I got frustrated after removing the battery several times that I just threw it away. The remaining detectors works great and look very nice in the home.