That is my concern too. I have 5 less than 1 year old First Alert wired SC7010BV with voice. I have tought about replacing all of them and getting the zwave model, but really wished there was a wired zwave compabile model.
I thought about the CO/Smoke Listener, but i was too worried about the voice causing issues.
Another concern is that there were several reviewers on amazing complaining that just a chirping for a low battery notification was enough to trigger a smoke alarm on the listener.