Advanced Sensing Technology: The ENS160 AHT21 sensor module is equipped with cutting- to detect Carbon Dioxide (CO2), equivalent CO2 (eCO2), Total Volatile Organic Compounds (TVOC), and also measures temperature and humidity levels. This makes it an ideal choice for environmental monitoring and HVAC systems High Compatibility: this sensor module is perfect for DIY electronics enthusiasts and engineers looking to integrate air quality monitoring into their projects Replacement for CCS811: This module serves as an upgraded replacement for the CCS811 sensor, offering enhanced accuracy and reliability in various environmental conditions Applications: Suitable for indoor air quality monitoring, smart home systems, and environmental monitoring projects, the ENS160 AHT21 provides real-time data to help maintain healthy and safe living environments. Due to different batches, there may be differences in product appearance and printed text, which not affect use Color:Blue Material:PCB Package Contents: 1 * ENS160 AHT21 Air Quality Sensor Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.