Power out or failed circuit alarm. Anybody tried these?

We get a lot of brown-outs and/or partial power failures affecting the electrical grid in the Central Coast region of CA (trees down, drunk drivers crashing into poles etc). I'd like to buy a 'power out/failure' alarm that will wait several programmable seconds before it blasts me awake and alerts me to a CPAP shutdown. The cheap twenty dollar ones are probably okay for most folks but I don't want to be awakened for a brown-out that only lasts a few seconds. Below is a link showing a list of several conventional 'power out' alarms (scroll down), however there is no mention of an alarm with a programmable interval. I don't mind spending the extra money for a quality product. I know there are such things for sump pumps and medical devices but I can't seem to find any for CPAP. Here's what's currently available on Amazon:

http://www.amazon.com/Failed-Circuit-Al ... +out+alarm

EDIT: Here's something I found that may be a work around, but, YIKES, it's expensive

http://www.qcsupply.com/390503-sensapho ... oductfeeds

I have one of the cheap $16 dollar ones. seems well made. I am one of those people that wants to be woken up if the power goes out.