It was introduced in many media such as TV and newspapers!You can easily see the carbon dioxide value of up to 4 wireless CO2 sensors that can be used as a guide for ventilation in the room.Since the carbon dioxide concentration is displayed in green / yellow / red, the need for ventilation is obvious.In addition, the temperature and humidity can be monitored wirelessly at the same time by using the same Logtta series temperature and humidity sensor together.The following wireless CO2 sensors can be used.https://www.amazon.co.jp/dp/B08NWB8YXK?ref=myi_title_dp