Review on Ultimate Safety: Battery Operated Smoke and CO Alarm Detector Combo Unit by Sean Powers

I bought 7 of these devices for a rental apartment (new purchase) consisting of 3 apartments. The old devices just weren't up to date and I didn't feel comfortable with them. Until I call an electrician to hook up the system they will work. One of my residents, a former volunteer firefighter, said the units are great - I think he tested their smoke section and was quite happy with the product. Hey, as long as my tenants are happy, I don't have to worry!