My neighbor put one in last year, every Monday morning it does the weekly test and then when power is out that thing is very noisy. Of course he put it on the end of the house where my bedroom is at!Yeah, on the noise. We have multiple neighbors with Generac back up generators. They run an automatic weekly test cycle for 15-20 minutes, which is bad enough. We are dreading listening to those things running 24-7 in a lengthy power outage.