A. 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). B. Features of the Air Quality Sensor CCS811: - Ultra - low power consumption, suitable for battery - powered devices. - High sensitivity and fast heating speed. - Intelligent algorithm to calculate total volatile organic compounds (TVOC)/equivalent carbon dioxide (eCO2) values. - I2C signal output, enabling direct communication with the main system. C. Main Features of the Air Quality Sensor CJMCU - 811: - Uses a metal oxide (MOX) sensor to monitor indoor air quality. - 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. - Has reset/interrupt control functions. D. Material: Printed Circuit Board (PCB) E. Color: Purple F. Package Contents: - 1 CJMCU - 811 module - 1 pin G. Only the above - mentioned package contents are included, and no other products are provided. H. 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 ±1 - 3 cm.