Features: brand new and high quality There are 2 types, one type is with infrared, another is with semiconductor. Large LCD Screen, clearly show the datas of Carbon Dioxide, temperature and relative humidity. With this CO2 monitor, you will know the actual level of carbon dioxide in the room to monitor the indoor air quality. It is important for our safety and for health. can be placed on desktop, light weight and small in size, easy to store and carry. Suitable for home, public site, agriculture, animal husbandry, industry, and more. Specifications: Material：ABS Size: 80X50X50mm/ 3.15x1.97x1.97 in Display: LCD segment code screen Three gr ds: 25-50% power Fourgr for ds : 70-75% power Five gr ds: 75-100% power Display area: 35mmX50mm Power supply: DC5V/1A Detection principle: Infrared induction Resolution: 3ppm Sampling time: real-time detection Package Includes: 1x Carbon Dioxide Detector( battery included) note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.