A: We use a combination of basic (Kidde) smoke detectors in rooms, along with Nest Protects in central areas. We have one Nest Protect outside the bedrooms, one near the kitchen, and another near our furnace mainly so that we're covered from a carbon monoxide standpoint as well.

A: It depends on your home and room layout and the fire code where you live. Generally, they are placed in bedrooms and near a kitchen plus in other enclosed rooms or areas. I have a condo and the living room and kitchen areas are open so only one is needed based on code where I live plus in each bedroom. That could vary based on your city or state - Google fire code for smoke detectors where you like and it should tell you the requirements.

A: The answer to the above question is YES. I found that I grew to like the first detector I installed, so now, I have multiple ones covering each floor and have installed a thermostat as well.

A: Yes. I have a nest protect and it is my only nest product. You can only link to your home network via an app on your phone so keep that in mind.

A: There is no subscription required or offered for the Nest Protect.

A: If you don't have WiFi, you would miss out on many key features in the Nest Protect including alerts or controlling the Nest on your cell phone(s), updates, and more. If you don't have WiFi, purchasing another brand of detector without those capabilities would be less expensive. "Wired" in the example on the box doesn't have anything to do with internet network connectivity (WiFi), it is the electrical connection. There are two options: Wired, which connected to the home's electrical wiring (if that spot is hard wired for the detector) or Battery, which has a replaceable battery and does not required a wired electrical connection.