I usually have a cabon monoxide detector and a smoke detector in my home but I ran across this combination smoke and carbon monoxide detector in home depot and figured it's much cheaper buying batteries for one product then buying for two. And it has worked out excellent, it's voice alerts and tells me if there is carbon monoxide and smoke in the house . No more of that crazy beeping sound that you get from the other smoke and carbon monoxide detectors.
It's very effective and and person like me who knows absolutely nothing about electronics could hook it up because it's battery operated.
I have bought for my parents and my grandparents especially for my grandparents because my grandmother is losing her hearing and it is very good for her.