As with all the Skylink security items it is not a simple thing to set up and get operating. You need to read the instructions and re-read them before starting. I am a retired home builder who has done a lot of electrical work. The site indicated a few hours work to get the security system in operation. It took me 6 solid frustrating hours to get mine set up. The system does protect the house as addvertised. However the one item is said to be a smoke and CO2 detector,it is not. I called the manfacture and they do not even make a smoke & CO2 detector. This item senses the noise a seperate Smoke & CO2 device makes when it goes off? This system was the best price for the most coverage.