How long do batteries last?

Using the batteries that came with mine, it went 275 days before the "batteries need changing" beeping started.

Advice on false alarms? Goes off every week or so. It's in our kitchen/living room, but goes off even when we are not cooking. Goes 1 min then stops..

I have this model and it always goes off. Every time someone takes a shower, or even when cooking and no smoke. I also have a fog machine now for Halloween and it goes crazy. I'm currently researching a different model because this one drives me crazy.

I have these througout my house and rental unit. Installed them about 7 years ago and many malfunctioning. Any durability mprovments since 7 yrs ago?

bought mine in Dec2017. It says 7 year warranty on this unit, so I'll see. Many CO detectors are only 5 yrs, but you can find higher quality ones (not avail on Amazon) that are good for 10 yrs and have dual sealed non-replaceable batteries (so install and forget for a decade). I bought this because it does both CO & smoke. I have a CO detector by our bedrooms that displays CO readings in real time above 11ppm, which is superior to this. Even low levels of CO is hazardous, and govt regs specify an alarm to sound only if >30ppm, not lower levels.

Can the voice part not be used (says programmable)? alarm/beep only?

I really wish it were. No, it will always use the bellowing voice. You can program which area the device is in, such as hallway or bedroom so the alarm will identify where the trouble is. Read the reviews carefully and believe them when they say it goes of randomly in the early hours and runs its test mode at 3am. I literally threw mine down the street at 3am after it went off for no reason the 4th night in a row.

Brand	First Alert
Style	Standard Detection
Power Source	Battery Powered
Color	White
Product Dimensions	2"D x 5"W x 5"H
Item Weight	9.6 ounces
Alarm	Audible
Sensor Type	electrochemical,photoelectric
Global Trade Identification Number	00029054856906
Material	case
Number of Items	1
Manufacturer	BRK Brands, Inc
UPC	029054856906
Part Number	SCO7CN
Item model number	SCO7CN
Batteries	2 AA batteries required.
Is Discontinued By Manufacturer	No
Size	1-Pack
Pattern	SCO7CN
Item Package Quantity	1
Number Of Pieces	1
Usage	personal
Included Components	First Alert Sco7cn Battery-operated
Batteries Included?	No
Batteries Required?	Yes
Battery Cell Type	Alkaline

First Alert SCO7CN Combination Smoke and Carbon Monoxide Detector with Voice and Location, Battery Operated, White

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