Features: The CJMCU811 sensors offers real time air quality monitoring, detecting CO2 and TVOC levels to support a healthier indoor environment. Featuring digital output via I2C interfaces, this sensors is easy to integrate into various project, with low power consumption and high sensitivity for accurate readings. Ideal for families concerned about indoor air quality, researcher in environmental science, and developers of intelligent home systems. CCS801bit MCUwith analogs-digital converters (ADC) for detecting indoor air quality, including carbon monoxides and a wide ranges of Volatiles Organic compounds (VOCs). Intelligent algorithm calculates TVOC values; Specifications: Component:Plastic Size:Approx.2x1.50cm/0.79x0.59inch Model:CJMCU-811 Testing Ranges:0-4000ppm Package Includes: 1pc Gas Sensors Module note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.