Stable CO Detection: Keep indoor air quality under control with this CO2 monitor for home. Dual infrared sensors measure CO accurately between 400 and 5000ppm, while simultaneous temperature and humidity display ensures stable, clear, and easy-to-read indoor environment data Compact Portable Design: Our air quality monitor is lightweight and compact, weighing just 0.46 lbs (0.21 kg). Carry it easily in one hand, a pocket, or a bag, and instantly monitor air in classrooms, offices, greenhouses, or labs without worrying about space limitations or power access Extended Battery Life: Equipped with a 2000mAh battery, this indoor air quality meter operates continuously for 72 to 120 hours