KiddeNighthawk Battery Powered Carbon Monoxide Alarm with Digital Display

My unit recently reached end of life - incessant beeping and END on the display. I had it 7 years. I checked the manufacture date and it's 2006! So apparently the end of life date can vary, but I bought this 7 years after manufacture date!! This should not happen by ethical sellers. Please check your dates and send it back if it is old. That said, I assume the unit did its job as we are all still alive.

The model advertised - copp-B-LS has a backlight. I received copp-B-LP without the backlight.Shame on them for this.Too much work to return. Kept it.

As an installer, I can attest Kidde saves me time because they get all the little things right with the mounting hardware, etc.PPM display is important to me because if the alarm should ever sound, the first thing I'm going to do is read the display. Then I am going to open a door or a window and see if the display changes appropriately. And if not, I am going to replace the unit as faulty and not let the alarm disrupt my life. After shutting off the gas, I hope to be able to move the unit toward the source and locate the leak. So having the display gives me options.

I replaced a CO Alarm by the same company that was 10 years old, and needed a replacement. Because the company has made a consistent design, I was able to just slip the old one off of its bracket, and slip the new one onto the same bracket. Could not have been easier. Thanks, Kidde, but making it easy to replace this, as per directions.

On Christmas day, I was alone when the carbon monoxide det. that I had for 10 years started to go off telling me to get out immediatly..called the fire dept. Turns out the detector had run its life course. The fire chief lent us one just like this and recommended buying this model. I bought this and so far it hasnt gone off lol. It shows on the screen a number that measures the level in the house and it refreshes like every 15 mins. I think if the fire chief says its good, then it must be because Im betting my life on it.

1) Detection: 70PPM = 60-240min, 150PPM = 10-50min, 400PPM = 4-15 min. The detection on this unit has accuracy of +/-30% in ideal conditions so don't falsely believe you're getting precision measurement ever. (Not that this unit is not particulary inaccurate compared to others, it's just the way CO detection goes in such units). You should know that as low as 30PPM are apparently harmful for kids/elderly, but there's a reason why this unit isn't that sensitive. This is a UL cert unit. UL certified units won't bark at less than 30PPM because of sensitivity/false alarms standards. That means it's not overly sensitive and simply good for healthy adults.2) Competition: Only one other option really exists. First Alert, same price & features:  First Alert CO410 Battery Powered Carbon Monoxide Alarm with Digital Display  It's reviewed poorly and not really a valid choice at this point (early 2012) due to quality/bugs. If this is the feature set you want, go with the Kidde no contest. Nighthawk line also have a good reputation and good consumer reports reviews. (Don't rule out First Alert for smoke detectors though... they have some good models there.)3) You'll actually receive model "KN-COPP-B-LP", not "KN-COPP-B-LS". That's because the LP (long life) replaced the LS (no longer made). Some reviews complain about the subtle differences, and I notice the amazon page still has references to the LS model in product description and product specification sections.4) Mounting: Saw a review saying it should be mounted low. This is incorrect. Manual advises "eye-level" as optimum, and table top as an option. Carbon Monoxide/CO is slightly lighter than air, but mixes well.. so high=good. If you need to know more, both the data sheet and the owners manual are available on Kidde's website.6) Network Considerations: Some people with multiple story houses like to have all the alarms networked (wirelessly or other) so they all go off at once. No such feature here, and when looking for wirelessly linked you are always stuck with buying alarms all of one brand/model/series so remember that. Also, unless you have a room/basement far away that you can't hear the screeching from you probably don't want them networked as it will prevent you diagnosing the problem's location and what to do (e.g. fire alarm going off in a certain room would let you rush to/away that location without slowing to check each doorknob vs. all going off at once and being disoriented about which direction to run after being suddenly awoken at 2AM.)7) LCD Monitor: I want it. You want it. But admit to yourself this is really just a nice to have that gives you confidence it's working right. From a practical standpoint this isn't much more than a gimmick. Again you're talking plus or minus 30% accuracy (e.g. 100PPM could be 70PPM or 130PPM). These are alarms, not monitors. About all you can/should count on for any such unit is an alarm when unquestionably deadly circumstances exist, not chronic unhealthy levels or some such.