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For Kidde 7DCO, 3070 customer reviews collected from 2 e-commerce sites, and the average score is 4.7.

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Amazon has 2990 customer reviews and the average score is 4.7. Go to this seller.
Ebay has 80 customer reviews and the average score is 4.9. Go to this seller.

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10.3.2013

This is a battery operated carbon monoxide detector that can either be wall mounted (wall plugs and screws supplied) or free-standing. It offers a clear and very audible alert should CO levels rise to dangerous levels (red flashing light accompanied by a loud alarm) as well as reassuring displays (green flashing light and CO reading in the LED panel) that all is well.The detector is supplied with the three AAA batteries it needs for setting up, so there is no excuse not to use it straightaway. Whilst I am using mine primarily in the home, I also intend to take it away on holidays for added peace of mind. The alarm sounds when the last of the batteries has been inserted so you will have an idea of what it sounds like and the cover can only be closed (easily anyway)when the batteries are present, minimising the potential to forget to replace these when necessary. Battery insertion is the only setting up the unit needs and you are then free to place it in the monitoring location.A detailed manual is supplied that outlines where to locate your monitor and it is suggested that one is placed on each level of a house, between 2 and 4 metres from a fuel burning appliance, out of draughts.A green light flashes periodically in the 'operate' window to indicate CO levels are being monitored and the current level is displayed in a small panel. If either 'Err' or 'End' are displayed in the panel the monitor needs to be replaced. If activated, the alarm will sound accompanied by a red flashing light. Weekly testing is encouraged (be prepared for a ten second loud alarm when you press the 'test/reset') and you can also check peak CO levels with another button press although only readings above 11ppm register (30ppm is apparently a non-dangerous level that can occur due to nearby heavy traffic, for example).Other than when testing and (once) due to an inadvertent press of the test button when dusting, my alarms have never sounded but their presence provides peace of mind that CO levels are being checked and there is nothing to worry about.
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3.8.2013

I tested this under a glass bowl with a tealight candle as the CO source and with the lip of the bowl resting on a teaspoon to allow some oxygen in to maintain the candle burn. After about 3-5 min the display read 56 ppm and steadily increased to 200 ppm after about another 7 min. At this point the alarm sounded. I removed the bowl and moved the alarm away from the candle which resulted in the CO reading decreasing at a relatively quick rate. The last reading was 36 ppm before it returned to 0 as the unit is designed to give a minimum reading of only 30 ppm in continuous monitoring mode. Thus I'm happy the unit can detect dangerous levels of CO and less dangerous levels (for adults)of 30-50ppm in continuous monitoring mode.The peak level readings are questionable as over the course of 4 hours with our gas furnace running (exhausted to the outside) the peak readings were 17, 17, 28, & 17 on one unit and 29, 28, 17 on another unit. Similar results (15-30 ppm) were obtained for the unit sitting outside (not near traffic). So either my home and local outside atmosphere has unusually high CO levels or the peak level readings are not so accurate. Hence only 4 stars.Overall I'm confident this product will keep our little girl safe in the advent of a dangerous CO leak but will be contacting the company regarding the peak level accuracy.
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7.12.2019

Check out the youtube link in the comments to teach yourself and your tenants what each alarm sound mean. The different alarms all sound alarming. When my tenant heard the alarm go off at 6am. This was the Kiddie without the LCD screen. I called out the gas guy. She was in a panic, which caused me to be in a panic. He didn't find any issues. When I got them two new Kiddie LCD alarms there were no issues either and it's been a month now. I got two because the tenant freaked out. CO is no joke. Nor do I want dead tenants on my permanent record. The old alarm was 8 years go so it might have given off the end of life alarm or the malfunction alarm. Which both sound very alarming.So £70 down the drain for call out fee, for not knowing what the alarms sound like.I would suggest to pay a bit more for the LCD screen to give you the exact measurements of CO. This can visually confirm the alarm. It also gives you the peak CO reading since it first was installed. Very useful for preventative measures. I'm probably going to replace the gas combi boiler with an electric one to avoid the hassle completely. A few of my neighbours have gone electric. The annual gas service check and maintenance and time required to organise these every year for 10 years makes the electric option more financially sound.
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28.3.2019

Firstly please take the dangers of carbon monoxide poisoning serious - I myself had a bit of a lax attitude to the dangers (we had an alarm but I never tested it) until two friends of ours had a VERY close call a few years back. They were lucky to escape their bungalow in time, having thankfully noticed the effects (they both experienced dizzyness, blurred vision etc), and it was a close call that could have been prevented with a working alarm. They were quite ill and shaken up after but things could easily have ended in tragedy so they were very lucky indeed. Since then I've made sure we always have 2 working alarms at all times as I owe it to my family to keep us safe.50 PEOPLE DIE THE UK EACH YEAR FORM CARBON MONOXIDE POISONING AND MOST OF THOSE COULD BE PREVENTED.Sermon over,and sorry for shouting but it's something that I need to get across after a wake-up call.Anyway, this was a bargain at just under £12 when I purchased it, and it looks to be a decent example with a nice clear readout, replaceable batteries and a very loud alarm. I use this as my main one now, with another one as backup as a failsafe as I don't want to be taking chances.Please make sure you have, and test regularly, a working alarm. Thanks.
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12.3.2013

As per usual great delivery from Amazon.This alarm seems to be just what I wanted, and at a reasonable price.Easy to follow instructions; I had it up and running very quickly.On checking the "Peak Level" reading (which I expected to be "0") it read "19".I followed the instruction booklet to zero this reading, but then got a Peak Level of "21".In case the meter/alarm was faulty I rang the 0800 number for Kidde. I was informed there is a "known error" and to ignore the instruction booklet!SO...... In case you have the same issue, ignore the booklet and do the following:1: Press and hold the "Peak Level" button.2: Press the "Test/Reset" button once and release it.3: Release the Peak level button.4: Wait a few seconds (without pressing anything)and then press the "Peak Level" button. It SHOULD be zero "0".Apart from that blip all now appears OK.Of course it's hard to rate this product (until such time as there is an actual Carbon Monoxide leak).With a 10 year expected life span this meter/alarm gives a degree of Peace of Mind.It seems well made and the alarm is loud.My only other suggestion/recommendation is - don't drill holes in your walls, use double sided sticky pads (NOT supplied).
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25.2.2014

To heat a small forest house without electricity I depend on a fireplace, a stove and a heater fuelled by petrol.All of these cause small amounts of carbon monoxide.In the manual of this device it says that more than 50ppm for over an hour is the limit at which you get the first signs of carbon monoxide toxication (nausea, headache).By heating and watching the display indicating the ppm it gave me a good feeling about my security and it allowed me to put in some more heat than I usually would have dared (the smell of the fumes gives the impression that the combustion is much worse than the indicator reveals!)You do not have to press the button to get the reading; it automatically rises (at the start of the fire)and then decreases gradually as the combustion improves.I would have expected it to give an alert when it rose over 50 but it didn't... The maximum reached was 62 for just a few minutes; maybe that's not a problem? I also tested it by blowing cigaret smoke into the inlet and it worked fine (I'm deaf now!)
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3.4.2016

I purchased this as I had a previous carbon monoxide alarm which was faulty - it would beep all the time, which alarmed us at first and made us think that there was actually CO in the room.The LCD screen should be present on all models - it is invaluable when a fault develops as you can immediately diagnose based on the LCD reading (instead of on a slightly different but very similar sounding series of beeps like on a display-less model).Also in the case of CO presence the display shows you the PPM of CO (the picture attached shows 13 parts per million of CO present) -- a fairly safe level. This is an important feature -- whilst an alarm can only indicate "CO present",this can give an accurate reading - the difference between:* 13 PPM (low danger, with no effect in the majority of people)* 100 PPM (potentially dangerous level)* 1000 PPM (highly dangerous level)is significant.Additionally, there is a "peak level" button which, when held for a second, will display the highest reading to date.
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5.3.2013

My initial impression is of a well made product which performs correctly, only over time will the reliability become apparent. However, do be aware that the the first issue of the instruction manual contains errors. Shortly after receipt of the unit I attempted to operate the peak level and peak level reset functions (following the instructions in the manual). None of the described functions worked. I reported this to Amazon as a faulty unit and, full marks to Amazon, a replacement was dispatched within 24 hours.Horror of horrors, the replacement also 'failed to operate'. A phone call to Kidde yielded the information that the instructions given in #6, page 14 of the manual are incorrect and should be corrected as follows:1.There is no backlight for the display.2. To zero the peak level memory hold down the peak level button and then press and release the test button, then release the peak level button.I hope that this information proves to be of use.Peter Smithers C Eng. MIET
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21.10.2013

Seems a good piece of kit though I have only tested it as it has not gone off in anger (and never does I hope). Siren is nice and loud and I think would wake anyone but the deepest of sleepers (depending on where it was placed of course). Come with a digital display which normally reads zero (on mine at any rate) But in the presence of carbon monoxide this should show the amount present in parts per million i.e. 35ppm. The display is a good size as are the digits shown on it. Has two buttons on the front, Test/Reset and peak level as well as 2 LED's, Alarm/Move to fresh air and Operate. Fairly comprehensive instruction manual explains all. Can be uses standing or fixed to a wall - the preferred option.Only 4 stars because before use the supplied batteries have to be inserted in the rear and I found that a bit fiddly compared to the two other detectors I have which just needed a pull out strip to start them working. Minor point but there you go. :-)
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18.11.2016

The important thing with these is do they detect carbon monoxide. Everything else is secondary. I tested one I have had for a few years just now by burning incense sticks near it (flaming, not just glowing) this is a method of testing these as they produce carbon monoxide.It detected the carbon monoxide and gave a readout of 82.Having seen reviews of other detectors where NO ONE giving a positive review said if the thing worked or not - here is a relevant review telling you the most important thing about it - does it work - YES.The only reviews on other detectors I saw that mentioned issues with detecting carbon monoxide were the 1 star reviews. This is why I decided to test the detector I have to be sure.And this one, the one I am writing the review for, works. So I am buying another the same.If you want to test yours, do what I described. You can look up various methods online too.
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7.9.2014

Very easy to set up and just required a couple of screws in the wall as mounting points, this provides that vital confirmation that the silent, odourless killer, carbon monoxide, isn't present.Having suffered from low level Carbon Monoxide poisoning thirty years ago as a child when the family gas fire was incorrectly serviced by a qualified engineer ( thankfully my parents called in another service engineer when suspicions were aroused as to why we all kept falling asleep and the carbon monoxide levels were still low) , I now need the reassurance of an alarm in the hopefully unlikely event that should similar should happen again, my own family will be alerted before lives are threatened.Display will hopefully always confirm a zero reading .The one thing to be aware of is that you must follow the instructions carefully to ensure correct positioning.Highly recommended.
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1.12.2017

This makes sounds when I press the test button and has a 0 on the digital display, which I presume means that my air is safe to breathe. How do I know this? I do not, but I trust that it does what it is supposed to do.Because what can you do besides trust? Test it? First off, the only way I can think to test it is with a car and a hose, and I don't own a car. Also, now that I think about it, I think that's a different kind of gas that kills you, in which case, that test would be useless. Also, I don't trust myself that I would run that test in a safe manner and not harm myself.What I am saying is that I must, and you must as well,trust that this machine does what it says it is going to do.What I can say is that it turns on and it makes a sound when I press the test button. Therefore, I give it 5 stars.
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26.9.2016

This unit is great in that it looks good and feels quality, with an added bonus of replacement batteries. However it is difficult to say how good it is at doing its job without being in the situation where we have a carbon monoxide leak, which isn't ideal!It should be noted however that when you put the batteries in, it will emit a short beep to notify you that it's working, that's according to the manual anyway. I'd argue that they need to be clear on the definition of short beep; unbelievable, ear bleeding screech is more how I'd describe it! I did check that I wasn't pushing test when I put the batteries in btw!So all in all, great; just pop some ear defenders on before you put the batteries in!4 stars as a)I can't attest to its effectiveness and b) I'm now mildly stunned by the test "beep"!
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2.3.2017

I bought this unit to replace an old carbon monoxide alarm that had expired. This alarm lasts for 10 years rather than the previous one's 5 years so already it looks like a good purchase. The alarm has a display on the front so you can see in real-time how much CO is in the air - useful. The unit is reasonably compact so sits on a shelf in the hall quite unobtrousively. Provides peace of mind that my family is protected in case of a problem with our boiler. Like most smoke alarms, the alarm sounds when you first put the batteries in so probably best not to do this late at night. Also, the alarm arrived in a blister pack which I was initially disappointed with. However,on the back of the blister pack is a perforated flap so you can open the packet without the need for scissors or cutting yourself.
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11.2.2021

I thought it about time I purchased a Carbon Monoxide monitor for the kitchen as we cook with gas. I likes the idea of the display so you have some idea of what is going on. However, thanks to a neighbour, I have compared the result displayed with a professional, calibrated British Gas issue monitor using the exhaust of my gas grill. The Kidde unit seems to read over 50% lower than the calibrated unit. However this could be because the professional unit uses a pump to suck in the gasses and so be getting a greater flow of exhaust gas.To see the peak value recorded by the detector, you must press and hold the peak button for a couple of seconds. This is not stated in the manual.It says just to press the peak button.Overall, it is still safer to have this unit than no monitor!
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