Oh, the CO detector is battery operated.
**Put batteries on the list!
MA codes now require CO detectors on every floor, and when we sell, we have to have installed smoke alarms in every bedroom, and they have to be hard wired. We have them now, in the hallways on each floor, and next to the furnace in the basement. No problem; SirKit can do that. He even considered installing a sprinkler system for in case of fire! I think I talked him out of that, though, for this house. He can do that for ours down South. ;o)