Instruction: Output yes if the supporting document can answer the given question. Otherwise, output no.

Input:
Question: What do I do when the blue light flashed every five seconds (there is no sound)?  Is it supposed to flash blue every five seconds?
Document: The moment I installed it, this did not work. The unit kept beeping every 40 seconds to indicate low battery despite (1) the unit was properly hard wired; and (2) the battery was new and working (and I tried several new batteries to make sure that wasn't the problem). I followed all troubleshooting suggestions in the enclosed manual, and none worked. I even had an electrician install the unit to make sure I hadn't screwed it up, but the never-ending beeping continued.
My only issue with this model is that the green LED that indicates it is operational is rather bright. For the detectors in public areas of my home, this poses no issue, but in the bedrooms the light from the LED is much brighter than I would wish. It's not bright enough to actually illuminate the room but it is bright enough to see it easily from anywhere in the room when the lights are off, and casts enough light to illuminate the outline of the unit against the surface it's mounted on.
I purchased five of these detectors to replace the out-of-date detectors which my home inspector failed to discover. They are easy to install. They matched up perfectly with the outlets. These detectors are designed to be linked to each other so in the event that one detector goes off, they all go off. Detectors have a limited life (seven years is typical), so please ensure yours are still good. The expiration date is stamped on inside the housing.
This no longer works and beeps every few hours. The battery has been changed (and tested). It is past the return window and their company has not returned my calls. A different smoke alarm works great in the same spot so it's not the hardwiring. Edited to add:  Customer Service just offered to replace it if I paid to ship it there. I hate when companies make you pay more for their defective product! Not a great way to keep customers.
Purchased as a replacement for a previous model of smoke detector from the same company. I've never had any of the problems described for this brand that others have described in reviews of other models, and I've lived with this brand for more than five years. I purchased the same brand because of the good track record and to ensure interoperability among all the detectors employed in my home.I like that this product works for not only smoke but also carbon monoxide and natural gas.
This model substitutes directly for my USI CD-9795, which failed promptly just after the five year warranty expired. This model includes a natural gas detector which I don't need because I have an all electric home. Unfortunately, this more expensive unit was the only one recommended by USI as a direct replacement. So far its working okay--no nuisance screaming like the failing USI CD-9795 exhibited in its waning days. Hopefully, this unit lives longer than its predecessor.
Smoke, CO2 and gas alarm combinations in one unit are hard to find. This is a good unit. Very easy to install....would have been a five star rating if it installed itself! One of the two units was defective, but USI replaced it under warranty by return mail.
We cannot use the oven in our apartment without setting off the alarm. Which requires us ripping it down from the ceiling and yanking out the batteries. Extremely annoying.And we're not the only ones. It seems like every week we can hear someone else's alarm going off throughout the complex.
Please note this is a 120 VAC with battery backup detector and should be used accordingly. That said it is easy to install, uses a standard electrical connector and multiple mounting holes for a variety of boxes.Covers smoke, CO and Natural Gas. Powers up, does a self check and then just works in the background. Warnings come with multiple light and audible (alarm) warnings so you can tell just what it is detecting.There is no exit lighting or voice warning, but I'm OK with that.
It is common that every year about 3% of the smoke alarm units will fail.So, on day one, one in thirty units will have a problem. Simply replace it. I'm not sure if this model has a higher rate of failure but if you remember that after ten years, one third of the units will not work during emergency then just replace them all
Answer: no