This combination smoke/carbon monoxide detector is absolute garbage! I have bought all types of kidde product's as a owner/landlord of multiple home's. I opted for the 10 yr lithium so, I didn't have to worry about replacing battery's or missing unit's in general. I took the first one out of the package, test, reset %26 the dang thing wouldn't stop going off! I eventually had to wrap in a towel, placed in a safe and threw the dang thing in my trunk! Two days later it finally expired %26 will be returning all 6 unit's! So much for a 10 yr lithium battery huh!? I suggest buying individual one's as my intuition was right %26 you can place the carbon monoxide one closer to floor level. Save your time and money. Kidde do Better!! You have our families precious life's relying on being alerted to a emergency.

I appreciate that I do not have to be concerned once a year to check battery.

Great product ~ gives me peace of mind knowing it detects both smoke and carbon monoxide.

[This review was collected as part of a promotion.] As described no issues.

We haven't had it a whole year and it was faulty 4 months.

Only last one year and very pricey

[This review was collected as part of a promotion.] Reliable brand. Would have like a better price.

Easy to hang up on the wall. I hope we never need to use it but if we do it will save our lives!

Great replacement alarm.

If I could them it zero I would. Half the alarms have failed.