The Smart Fire Control Companion Kit monitors the concentration of smoke and gas in indoor spaces. If defined thresholds are exceeded, it sounds an alarm of up to 85 dB and simultaneously uploads the information to a smartphone to allow countermeasures to be taken quickly. The set can simultaneously be connected with the hub via ZigBee 3.0, and in the event of danger can work together with other smart home products, e.g. to automatically open windows or close gas valves.