Well, my CO detector went off today. The beeping matched the frequency that let me know it was just too old and needed replacement. (It was listed as a 7 year detector, died at 6 and a half). Time to get a new one. What recommendations do you guys have? (Specifically looking for Firefighter Jake here). I already have the smoke detectors thoroughly covered, so i am not too concerned with a dual unit. battery is easier, plug in is ok too. Digital readout important? Thoughts?