Features: brand new and high quality In alert mode, the user is alerted to the environment by changing the color. Intelligent color screen display, clear numbers, easy to identify and read. It can detect and display the temperature and humidity of the environment to help the user understand the environment. It has a long life and can be recharged using a USB cable. It is suitable for office, home, gym and other occasions, with a wide range of applications. Real-time monitoring and real-time display of carbon dioxide concentration per cubic meter. Small and portable, easy to carry, does not take up too much space, can be installed in the home. There are 4 types, pink with infrared, pink with semiconductor, white with infrared and white with semiconductor. Specifications: Material: ABS Size: 80x80x50mm/ 3.14x3.14x 1.96 in 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. Package includes: 1x Air Quality Monitor ( battery included)