CO2 detection, *HCHO and **TVOCs, temperature display Sensor connected via an app to your Smartphone Connectable via Bluetooth For areas of 30 m² Ft 75 x 50 mm Operates on USB 5V, adapter not included CE certified Color: white *HCHO: formaldehyde: carcinogenic organic compound present, among others, in tobacco smoke **TVOCs: total volatile organic compounds: organic compounds that evaporate easily, such as chemicals in cleaning products, paints, etc.