Features: brand new and high quality Real-time monitoring and real-time display of carbon dioxide concentration per cubic meter. With clock function. It can detect and display the temperature and humidity of the environment to help users understand the environment. 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. In the alarm mode, the user is prompted to pay attention to the environment by changing the color and voice. 400-1500ppm green, 1500-3000ppm yellow, buzzer 2s once 3000-5000ppm red, buzzer 1s once. It has a long service life and can be charged with a USB cable. It is small and portable, easy to carry, does not take up too much space, and can be installed at home. Specification: Product Name: CO2 Meter Power Supply: USB Adapter CO2 Measurement Range: 400-5000ppm Material: ABS Color: White+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.)