Simple operation: hold the on/off button for three seconds to activate automatic CO2 detection. Real time monitoring: color backlit display visually indicates CO2 concentration changes for ataglance awareness. All in one air data: measures carbon dioxide, temperature, and humidity simultaneously. Portable power: builtin 1200mAh battery recharged via USB for flexible placement. Compact design: small desk friendly enclosure suitable for home or office use. Reliable for families: helps maintain healthy indoor air in living spaces and work areas. Use scenario 1: In a living room during meals or gatherings, monitor CO2 levels and ventilate when needed to maintain comfort. Use scenario 2: In a home office or study room, track air quality to support focus and comfort throughout the day. Use scenario 3: In a small classroom or meeting room, observe occupancyrelated CO2 trends to manage ventilation effectively.