Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: At what concentration of CO/methane does the alarm register on either the LED screen or emit audible beep/horn?
Document: I previously had written a high review for this CO detector. But I've had to completely revise my opinion. I had several of these, all purchased around the same time. They worked great at first, except for the occasional "false" alarm on hair spray etc. (which would be expected for anything meant to detect volatile gases).However, after about a year, they started going off constantly. If a battery wasn't in, the unit would beep.
-----I was cleaning with 99% isopropyl alcohol (rubbing alcohol) when my Kidde Nighthawk 900-0113 explosive gas/carbon monoxide (CO) detector went off. It was built to detect methane--Natural Gas--and propane, but I guess it detects anything explosive, fortunately. There was a lit pilot light in the room; the alcohol vapor did not reach explosive concentrations before the alarm sounded or I would not be typing this.
I would have given it 5 stars if I'd know not to put it near a heat/air register/vent or in the kitchen or in the heater room. That being said, we placed one in each of our hallways (from the garage & laundry room & outside the bedrooms). Is it loud, YES! We already have CO detectors in the bedrooms, we really wanted this for the Gas Alarm. Hopefully, it never goes off.
Had Kidde before for a CO detector and it lasted the entire time they said it would and no false alarms. You will know when the life expectancy runs out for the detector it will beep and give you the error code letting you know it needs to be replaced. I'm really happy with it and with this new addition of explosive gasses etc and the low price why not. The price on Amazon is much better than Lowes, Home Depot.
None of the CO monitors ever go off, so I think I'm OK there, and this tells me I have no gas leaks either. I never smell any leaking gas, so I'm fine with that, but its hard to say if this will detect and alert me to a gas leak until I actually have one. If nothing else, I feel better having something that will potentially alert me to a gas leak than having nothing at all.
My Mom started feeling sick the week after having her gas furnace serviced. I brought over my CO detector (Kidde brand, earlier version) and about five minutes after plugging it in it started alarming-registering 256 on the digital screen!! Every CO detector that I have bought in the past ten years just paid for itself in that moment.CO detectors generally have a 5 year life.
Having two lets me double check the whole CO detector system as well as having adequate coverage. Once the upstairs detector started alarming and read GAS instead of registering a number on the screen. Turns out that my husband was making a big pot of mulled wine and putting high enough alcohol vapors into the air, that it set the detector off! Read the fine print-these babies detect flammable vapors as well as CO!
I'm sure the initial concentration had been 3+ times that much.If my light switch had sparked - I could have been killed. For this unit to NOT have sounded any kind of alarm is truly scary.
We've had this combo unit for about a year and about every month it goes off with the "explosive gas" alarm (for methane and propane, neither of which is present in our house).It's a very loud and piercing alarm, but it will not turn off even though we hit the reset button - we have to unplug it from the wall and take out the 9 volt battery to stop the alarm.
This is my second Nighthawk C0/Gas detector. The first one went through its 7 years without issue. The alarm is piercingly loud and will get your attention if you are sleeping. It could use a &#34;silence&#34; button like most smoke detectors have. It is particularly sensitive to methane... so stay away from it if you have been eating beans.
Answer: yes