Features: Adopting advanced CO2 sensors to monitor indoor carbon dioxide concentration in real-time, ensuring accuracy and stability. Integrate temperature, humidity, and air quality indicators to provide comprehensive environmental data at a glance, helping users understand indoor air conditions. Easy to install on the wall, saving desktop space, and suitable for various indoor environments such as bedrooms, living rooms, and offices. When the CO2 concentration exceeds the set threshold, sound and visual alarm will be triggered to remind users to take measures to improve air quality. Clear large screen display, simple operations, easy to set up and view data. Specifications: Component: ABS Size:Approx.80mm/3.15''x80mm/3.15'' Package Includes: 1Piece CO2 Detector note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color of the item.