Kidde KN-COB-B-LP Nighthawk Carbon Monoxide Alarm, Battery Operated - 21007268

Two came with my house. I bought the next two when those first two needed replacement. After years of faithful service, they let you know (via a beep code) that its time to change them.When we first bought our house, our ventilation was a bit messed up and we had CO not venting. These alarms tipped us to the problem before we felt any effects. We ordered one of those free energy audits that you get from the power company and the auditor confirmed the ventilation was not right. The HVAC people changed it and we haven't had a CO build-up in two years.This is the light model, the next model up has a readout but you don't need a readout -- you just need an alarm when something is wrong.

Same model, but an older unit that looks exactly the same expired at 7 years. This unit is now rated up to 10 years. They unfortunately cheaped out on some chinese crap batteries instead of USA duracell’s that it used to ship with.Unit is made in china, so it feels and looks cheap, but it works.

Decent price for the carbon monoxide detector. Installation was easy, but battery install was very "tight" to get batteries (supplied) in. 3 AA batteries supplied which is always nice. Manual & packaging states 10 year expiration. Purchased 11/2018, detector has a 07/2017 manufacture date on the inside. However, manual also states "... 10 years from initial power up,,,"

There were so many deaths this year from carbon monoxide poisoning, that we realized we needed to get a detector in the house, but didn't want another round disk like thing hanging on the wall, particularly where it would need to be hung.The smaller size of this allowed us to hang it over the door inside the utility room where our furnace and hot water heater are. I'm happy to say it hasn't gone off... but it's working, so, we have a greater sense of comfort.This has a long life battery and cartridge that we think we should be good for several winters to come.

I picked this up and am gonna have to buy more. Out of the packeage this comes with the batteries needed to work, durecell, and screws. Its an easy two screw install: two screws mount the back plate to the wall, and the monitor slides down on the plate to mount. Aesthetically: it looks like a thermostat, about the same size too. I put this in the middle of the wall towards the end in the middle of the room, and I dont even notice it. I have to tell you, compared to the rest, this looks the best. I bought a different brand and it looks like a huge box... Unlike this! There are about several different alarms to tell you whats going on with the unit. Several different language instructions are included.

Easy to install and replace batteries. The mounting plate attaches to the wall and the alarm slides onto it. Uses 3 AA batteries. I have two of them, one on the first floor and one in the basement bedroom. Mount them closer to the floor since Carbon Monoxide is heavy.

After realizing the previous model of this item was blinking and sounding that it was warning of END OF LIFE CHANGE, it was simple to replace with another identical model and even use the old mounting plate.

Functions as expected. In someone's lifetime they will come up with a standard hole pattern so replacement will be plug and play rather than drill, cleanup and play.