Bests & Worsts Reviews from Amazon

I just ordered this item for a rental unit and was informed by my property manager that this specific model does NOT comply with Colorado law, which requires plug-in units to have a battery back-up. If you are ordering in this to comply with new state regulations, make sure you are buying the right model. I've asked Amazon to note it on the website, but thought I'd just alert everyone in the mean time. 5/2/2012 Update I have put a 1 star on this product purely to call attention to the fact that Colorado require battery backup plug-in carbon monoxide alarms, and all buyers should verify the requirement in their respective states. Recently, my claim has been put to question, so I feel compelled to respond. In the very first section of CO House Bill 09-1091, (1)-(c), it states clearly that if a carbon monoxide alarm is a device that if plugs into an electrical outlet (which is the case of this specific product), must also have a battery backup (which this product does not offer). See below: (1) "CARBON MONOXIDE ALARM" MEANS A DEVICE THAT DETECTS CARBON MONOXIDE AND THAT: (a) PRODUCES A DISTINCT, AUDIBLE ALARM; (b) IS LISTED BY A NATIONALLY RECOGNIZED, INDEPENDENT PRODUCT-SAFETY TESTING AND CERTIFICATION LABORATORY TO CONFORM TO THE STANDARDS FOR CARBON MONOXIDE ALARMS ISSUED BY SUCH LABORATORY OR ANY SUCCESSOR STANDARDS; (c) IS BATTERY POWERED, PLUGS INTO A DWELLING'S ELECTRICAL OUTLET AND HAS A BATTERY BACKUP, IS WIRED INTO A DWELLING'S ELECTRICAL SYSTEM AND HAS A BATTERY BACK-UP, OR IS CONNECTED TO AN ELECTRICAL SYSTEM VIA AN ELECTRICAL PANEL; AND (d) MAY BE COMBINED WITH A SMOKE DETECTING DEVICE IF THE COMBINED DEVICE COMPLIES WITH APPLICABLE LAW REGARDING BOTH SMOKE DETECTING DEVICES AND CARBON MONOXIDE ALARMS AND THAT THE COMBINED UNIT PRODUCES AN ALARM, OR AN ALARM AND VOICE SIGNAL, IN A MANNER THAT CLEARLY DIFFERENTIATES BETWEEN THE TWO HAZARDS. From: [...]