Description: Air detector adopts infrared sensor to measure CO2, temperature and humidity, which is more accurate, more reliable and more durable than traditional electrochemical sensor. It is equipped with a hook, which is convenient to carry and does not take up space. There is a large display for this air detector and it has color indicators to show CO2 levels (400-800PPM green, 801-1200PPM yellow, 1201-1500PPM orange, 1501-5000PPM red). It uses an automatic alarm system that automatically sounds a beeping alarm when CO2 levels exceed 1500PPM. It is made of high-quality ABS and PC material. The diameter of each product is 73mm. The thickness of the product is 18mm. It is suitable for bedrooms, offices, schools, cars, travel, etc. Item Name: Air Quality Meter Material: ABS, PC Features: Infrared Sensor, with Hook, Three-in-one Detection Power Supply: 1200mAh Battery Test Objects: CO2, Temperature, Humidity Size Details: Diameter: 73mm/2.87"(Approx.) Thickness: 18mm/0.71"(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Air Quality Meter 1 x English User Manual