Saw this on another site. They are apparently going for a UL listing but not there yet. It seems they are more worried about how to conveniently silence false alarms than in making a device with a reliable sensor and setting alert parameters that actually protect people. For those who don't know, alarms listed to UL 2034/2075 are NOT designed to protect against CO poisoning but merely CO death. They are intended to alert only once you've reached a COHb of 5%, which means you must already have CO poisoning before they are supposed to alert. I say supposed because they are also notoriously unreliable.
If they would change the alert program to a low level unlisted monitor they might have something. Until then, I'll just have to remain cynical.