Features: 100% brand new and high quality Real-time monitoring and display of carbon dioxide concentration per cubic meter. It can detect and display the temperature and humidity of the environment to help users understand the environment. There is also a smoke alarm function. It is suitable for offices, homes, gymnasiums and other occasions, with a wide range of applications. Intelligent color screen display, clear numbers, easy to identify and read. 4-color LEDs and an audible alert function to make air quality more intuitive. 0-499ppm shows green; 500-999 shows yellow; 1000-1499 shows orange; 1500ppm+ shows red. It has a long service life and can be charged with a USB cable. The CO2 detector has 2 types of placement effects, it can be placed standing up or hung on the wall. Equipped with USB charging cable, which can be used in special scenarios, such as stations, hospitals, etc. Specification: Product Name: CO2 Meter Power Supply: USB Adapter Battery Capacity: 3000mAh CO2 Measurement Range: 0-5000ppm Resolution: 1ppm Material: ABS Color: White Size: app. 10.2x14cm(4.02x5.51in) 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.)