1. CCS811 - 811 Digital Built - in Air Quality Monitoring Sensor: The CJMCU - 811 is an ultra - low power digital sensor that integrates a sensor and a CCS801 - bit microcontroller (MCU) with an analog - to - digital converter for detecting indoor air quality, including carbon monoxide (CO) and various volatile organic compounds (VOCs). 2. Features of the Air Quality Sensor CCS811: - It has ultra - low power consumption and may be suitable for battery - powered devices. - It has relatively high sensitivity and fast heating speed. - It uses an intelligent algorithm to calculate total volatile organic compounds (TVOC)/equivalent carbon dioxide (eCO2) values. - It has I2C signal output, which can enable direct communication with the main system. 3. Main Features of the Air Quality Sensor CJMCU - 811: - It uses a metal oxide (MOX) sensor to monitor indoor air quality. - It integrates a bit microcontroller with a built - in first - level algorithm for sensor reading and digital conversion. - The I2C slave interface can be directly connected to the main control system. - It has reset/interrupt control functions. 4. Material: Printed Circuit Board (PCB) 5. Color: Purple 6. Package Contents: - One CJMCU - 811 module - One pin 7. The package includes only the above - mentioned contents, and no other products are provided. 8. Note: Light reflection and different displays may cause slight differences between the color of the item and the actual object. The allowable measurement error is around ±1 - 3 cm.