Instruction: Given a question and the related document, predict if the question is answerable based on the information provided in the document. Output only yes or no.

Input:
Question: Does it still work if you just don't use a battery? I'm not worried about the power outage issue with this one. Can I just not use the backup?
Document: I bought this unit because we have a fireplace. While the unit appears to work detecting carbon monoxide, as another reviewer noted it drains batteries like no tomorrow. The battery in this unit is certainly NOT used for backup. We just went through a 4 day power outage and the unit drained batteries every 4 to 6 hours. We had to keep replacing them as we were using our fireplace as our only meager source of heat. Even with AC power the battery still only lasts for maybe a month. I'm very disappointed in this model, especially since I paid good money for it.
This is a replacement to the same exact CO detector I had before. It's UL certified, has a digital readout and a battery backup, all things that you should look for in a CO detector. You need a battery backup because if your power goes out, it won't work without one, and power outages are when a large number of CO poisonings happen. (Can you tell I'm in the health field?) After about five years the sensors degrade, so you need to replace it, which is why I bought this one.
I purchases three of these newly designed carbon monoxide detectors to replace my older ones (about 10 years old). I put one one each floor to ensure one is heard. These were easy to install the battery and plug in. Just like my previous ones, the digital display with the ability to see the highest previous reading is a great feature.With the battery backup, these can still continue to monitor even if the power goes out. Since I have use a kerosene heater in the house in prior years, this might come in handy.
Two mature adults with pets, we have used various CO detectors for about 12 years, The KN-COPP-3 has been here for the last 3.Was glad to upgrade to a unit that had digital readout and battery backup, looked at many and this one stood out for features and price. I change the 9v battery when I do the smoke alarms every year and they still have enough power left to use in something less important like a radio or VOM.Now and then I will unplug it and use as a handheld detector as I walk around the house and into the basement to check for any leaks.
I thought the Kidde would work off of household current, and would use batteries only as backup. Not so, apparently, because I'm on my third battery. It always seems to beep the low battery signal at 3 a.m., too, so I've finally just unplugged it, taken out the battery, and will probably throw it away. Sad, because I thought it would be a good product.
I can't say whether it's good at sensing CO, but this thing beeps when it is using backup battery (even with a fresh battery). Power goes out? This will beep all night. After the third power outage and removing the battery a few Summers ago, we just never plugged it back in. Also, it's big and heavy and requires a tight wall outlet to keep it from falling out and on the floor.
I own two of these CO2 detectors, and after having both for just over 6 months, I'd recommend looking elsewhere.I have already replaced the batteries on both 3-4 times, and that is without any power outages in that time. According to the manual, the battery is a backup and is only used when there is a power outage. This is not true... If the unit won't function without a charged battery installed, it's being used all the time.In my case, this has been an expensive lesson to learn that Nighthawk / Kidde products aren't as good as they used to be.
This instrument saved my life recently during a power outage. When the power went out my gas furnace was operating at maximum. This caused the electric blower to stop suddenly. The furnace was full of hot air, gas, partially combusted gas and carbon monoxide which had no place to go except into the room air. My Nighthawk CO alarm, which has a battery backup, alerted me to the potentially lethal situation and I was able to open the windows. Never go to sleep without it.
We have used a "Nighthawk" for many years and only purchased a new one when the old one went south.However, when the power went out for 7 days the backup battery also went south after only three days !This unit cannot be used without a backup battery. So we are left with a useless detector until we can get to a store.Needs a little (design) work !
This device DOES NOT WORK when plugged into the wall outlet. You have to insert a 9V battery for it to run on AND THEN plug it in. I'm not a electrical engineer, but I've never owned an electronic device that needs two sources of power in order to work.It'll ignore the outlet and burn up the battery in a few days, then the alarm will go off at random...probably in the middle of the night. There is no way to shut the alarm off. You have to take out the 9V battery.I got so sick of this thing going off that I threw it away.
Answer: yes