Kidde KN-COSM-IBA Hardwire Combination Smoke Carbon Monoxide Detector Battery Backup Voice Warning Interconnectable (2-Pack)

I purchased what was initially installed in our home 7 yrs ago. We have 1 upstairs and 1 down. These apparently, are the master to all the additional detectors that are connected to these 'brains'! After we took the bad one down (12' in the air), we left the part that is screwed to the ceiling with wire connectors dangling. When the new ones came, we checked the connectors and they were the same and it was installed in a matter of 2 min. Most difficult was climbing up and down that horrible ladder. The pkg came with 2, so when the one quits upstairs - we know what to do! Perfect match!

Two of mine finally took a dump after just under 10 years . These come with an internal Lithium back up battery and are supposed to last the 10 year life of the unit, so they are a little more expensive. My old units (same make) had the same plug types so my instalation per unit was less than a minute each. Took longer to open my A Frame ladder, than install the new Detector. Aside of the cost, very pleased!

The battery access opens on the back of the device, but because it is supposed to be wired to electrical and the wires are very short, I would have to disconnect it from the wiring every time to change the batteries. Adding to the problem, the wire connection to the device is a different design and more difficult for me to disconnect, especially while standing on a ladder. Therefore, I was forced to put it up without connecting to electrical, defeating the purpose of connecting to all other alarm devices within the house.

This is the quality product you want for smoke and carbon dioxide detection

It was slightly different. But it did the job

As advertised worked perfectly

This is a great product, sorry I was not able to utilize them.

This was a terrible purchase. Things should NOT be non- refundable. Two customer service reps said they would help but didn’t. Then the third one just said no. We should know when it is a third party selling!