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| Features• Digital display displays the level of carbon monoxide the unit is sensing
• Large backlit display is easy to read even in low light conditions
• Peak level memory displays the highest CO concentration measured since the last reset
• Front load battery door allows you to change battery without removing alarm from the wall
• Kidde?s carbon monoxide alarms meet the requirements of Underwriters Laboratories (UL), an independent facility that tests products for compliance with widely-accepted safety standards
It works... but there are some issuesThe overall design of this detector is pretty good. The battery compartment is very accessible (helpful for wall mounted units) and the test/peak buttons are easy to operate. Plus, there is a built-in stand, if you prefer not to wall mount it (although a wall mounting is certainly best).
There is one flaw that creates some confusion, though. When you press the "test/reset" button, the unit will automatically go into a test cycle. Some numbers may display, but these are not CO readings, only part of the internal test process. One might misinterpret this as a previous peak reading. You won't know this unless you read the manual.
The peak display is easily viewed and is accompanied by a back light. This is useful.
The display won't show 30 PPM or less readings, but it will detect 11 PPM or above. Supposedly pressing the peak level button will show what was last detected. What these makers should provide is a slightly better LCD display that also shows the date/time of the CO level detection. This information could be helpful in pinpointing the cause.
These units are designed to be disposable. After 7 years, you're supposed to junk it and buy a new one. Why? According to UL, "UL 2034, the independent standard applicable to CO alarms, requires CO alarms to have an end of life warning. This requirement went into effect in March 2007, meaning any CO alarm manufactured after April 2007 with a UL listing must have this feature. Most states that require CO alarms in residential dwellings mandate that the alarm meet the UL 2034 standard."
Apparently internal components have a risk of going out of tolerance over time. And since these units are so inexpensive, there is no means of calibrating them (or the cost of calibration would exceed the replacement cost). I can appreciate this, except that Kidde makes no provision or recommendation for disposal. I guess you just let this thing go in the trash to become part of land fill?
My particular unit was manufactured in March 2005, but did not get put into use until March 2008. After two years of use, there is a problem with the LCD display. Almost half of the segments fail to show (curiously, the ones for "0" still work). When you replace the battery, Kidde did put in a smart function that will momentarily show 888, which proves whether the segments are functioning. I contacted Kidde and they informed me the alarm will still function, but that I just won't know what the actual CO level is. Nice. No offer to replace it. I am just outside the 5 year warranty, even though it has only been in use for 2 years.
I am a little hesitant to try another Kidde alarm model... but they do seem to be the most popular and recommended--there aren't many alternatives on the market. If I get another one and it suffers the same display problem, I will look hard for a model from another brand.
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