Efficient smoke alarms are available either in standard version or wireless connected in series. It is also possible to have a smoke alarm that is in contact with a house alarm so that you can be alerted about smoke development even if you are not in the home.
Most smoke alarms have a sensor that responds to combustion particles in the air - ie. eg smoke. This sensor cannot respond to flames or gas spills. Some fire alarms also have a built-in heat sensor, which increases the chances of an early warning of a fire or other dangerous incident.