This case is inteded to be used as a Luftdaten.info sensor and houses the SDS011 particle sensor as well as a Wemos D1 Mini. The USB connector of the esp module is accessible from the outside.
Also a SI7021 / HTU21 or a BME/BMP280 can be mounted in the case.

For example:
https://www.amazon.de/AZDelivery-GY-BME280-Barometrischer-Sensor-Parent/dp/B07D8T4HP6
https://www.amazon.de/GY-21-Feuchtigkeit-Temperatur-Feuchtigkeitssensormodul-I2C-Schnittstelle/dp/B0DSVMSZ3L