Key benefits No calibration required: simply power on the unit to start accurate CO2 detection, minimizing setup time and downtime. Reliable CO2 sensing: uses an electrochemical sensor module for accuracy with strong antiinterference performance, ensuring stable readings. Low power consumption and long life: designed for efficient operation with minimal maintenance needs. Clear multiparameter display: large screen shows power status, CO2 concentration, temperature and humidity for quick environment assessment. Flexible options: four variants to choose from based on needs: black 3 in 1, black 5 in 1, white 3 in 1, white 5 in 1. Product features Detection method: accurate CO2 measurement via an electrochemical detection module. Display information: large screen presents CO2 levels, temperature, humidity, and power status at a glance. Variants available: four types — black 3 in 1, black 5 in 1, white 3 in 1, white 5 in 1. 3 in 1 models: monitor CO2, temperature and humidity. 5 in 1 models: provide additional sensing capabilities beyond CO2, temperature and humidity. Use scenarios Office and classroom environments: monitor CO2 levels to maintain air quality and comfort, with immediate visibility of temperature and humidity. Small commercial spaces and homes: track CO2 along with ambient conditions to ensure safe storage and living environments. Laboratories and industrial spaces: benefit from quick CO2 detection with low maintenance and reliable performance, especially in settings with potential interference. Specifications overview (based on provided information) Sensor type: electrochemical CO2 detection module. Display: large screen showing power, CO2, temperature and humidity. Calibration: no calibration required. Variants: four types as listed above (black 3 in 1, black 5 in 1, white 3 in 1, white 5 in 1).