Features: brand new and high quality Using professional infrared sensing detection technology. This CO2 meter has stable performance, and provide high accuracy and fast measurement response. Large LCD screen, clearly show the datas of carbon dioxide, temperature and relative humidity. Wide application: Suitable for home, public site, agriculture, animal husbandry, industry, and more. 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. It can be placed on desktop, light weight and small in size, easy to store and carry. Equipped with USB charging cable, which can be used in special scenarios, such as stations, hospitals, etc. Specification: Product Name: CO2 Meter Display: LCD Detection Principle: Infrared Induction Power Supply: USB Adapter Voltage: 3.7V CO2 Measurement Range: 400-5000ppm Resolution: 1ppm Material: ABS Color: Silver+Black Size: app. 8x5x8cm(3.15x1.97x3.15in) Quantity: 1 set Note: Transition: 1cm=10mm=0.39inch No retail package. 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. Thank you! Package includes: 1 x CO2 Detector 1 x USB Cable (other accessories demo in the picture is not included.)