U169 ENV Pro Unit M5Stack U169 ENV Pro Unit uses the BME688 sensor to support Volatile Organic Compounds (VOCs), temperature, humidity, Indoor Air Quality (IAQ), and atmospheric pressure measurements. This unit operates from 300hPa to 1100hPa pressure range, -40°C to 125°C temperature range, and 0% to 100% humidity range. The U169 ENV pro unit features an I2C communication interface and is resistant to humidity, cold, dryness, and heat in extreme conditions. This unit offers low power consumption and sensitivity with a detection range of parts per billion (ppb) level.