Very pretty, but.... Item arrived quickly and is very impressive. Small, neat and attractive, it takes up less space than the previous smoke detector only. It is easy to install - 2 screws for the backplate and then the detector just twists into place on the backplate. It takes 3xAA batteries. I've never seen AA batteries in a smoke detector before so I dont know what the battery life will be. Having said that, I always have loads of spare AAs on hand but always need to go out and buy the more standard (v especially, so I kind of like having the AAs.When the item detects CO it measures the amount and shows this on the small LCD screen. Any detectable amount gives an audible warning to open doors/windows, and any dangerous amount send it into full alarm mode. The smoke detector is a photosensor type. All in all I really like this item.Here's the 'but' though. No CE Certification is listed either in the manual, specification, packaging or on the item itself. I messaged t