Kidde KN-Copp-B-LPM Monoxide Alarm, White

Bought January 2016. It must count the hours from when it's activated, because it chirped and displayed 'END' at the 10 year mark. (Unfortunate that it was at 4am.)

I purchased this kidde co detector for our car or when we travel. I got this brand coz it’s UL-certified, so I know it meets safety standards and has been properly tested that alone gives me confidence it’s reliable. Setup was easy since it runs on AA batteries, no wiring or complicated installation required. The LED indicators make it simple to check status at a glance, and the test/reset button works smoothly. It also says there will be low-battery alert, so it won’t quietly stop working without me knowing. The portable size is another bonus it’s easy to move if I want coverage in other places, or even take it along when traveling. For anyone looking for a trusted, approved, and low-maintenance CO alarm, this one really covers the essentials. You have to do research before buying

GOOD

Not working

The alarm is reliable. The CO level reading is excellent for confirmation of the presence of carbon monoxide. I do not have a gas stove in my condo, so my previous alarm for the last 10 years did not sound the alarm when I was at home. However, I did take the alarm for a test in my car and in Los Angeles' traffic jam about 9 years ago. The alarm did not sound off when my car windows were closed during a long journey with air recirculation inside. But when I opened my car windows during a very heavy traffic jam to test the air outside, the alarm did sound off briefly with a reading showing a low level of carbon monoxide. Please note that the 10-year warranty begins when the alarm is first installed. The life span of the sensor is also 10 years, starting from the date of power on. Google AI says the 10-year warranty and the life span of the sensor both start on the date of manufacturing, but that is wrong information. In fact, when the alarm is sealed in the plastic package, the sensor undergoes only insignificant degradation. Therefore, the sensor is good for 10 years when unpackaged and installed and the 10-year warranty starts when the alarm is first powered on. Kidde should provide better training for its customer service so that they don't give the same wrong information Google AI gives.