3 in 1 air quality monitor, accurately detect CO2 level, temperature and humidity. Adopted high precision infrared sensor and high performance chip , providing fast and reliable detection. Easy to check real-time data on the colorful LED display with large digits, quickly capture results. 4 levels of flashing indicators demonstrate different CO2 concentration, alarm will be triggered when the value exceeds 1000PPM. Built-in 2000mAh large capacity lithium battery, get rid of the annoyance caused by cables, flexible to use and charge. Features: Real-time monitoring and real-time display of carbon dioxide concentration per cubic meter. It can detect and display the environment temperature and humidity to help users understand the environment. It is suitable for b offices, homes, gyms and other occasions with a wide range of applications. Smart color display, numbers are clear, easy to identify and read. In alert mode, the user is alerted to the surroundings by changing the color. It has a long lifespan and can be charged with a USB cable. Small and portable, easy to carry, does not take up too much space, and can be installed at home. Specification: Measurement accuracy: 10 ppm Measurement range: 400-5000ppm Operating voltage: 3.7V Current: 120mA Power: 0.4W Module: Semiconductor Display: LED display Power supply: 3 x AA batteries or 1 x 18650 battery External power supply: standard with USB cable Material: ABS material White color Product size: 80*142*35.5mm Number of pieces delivered: 1 piece becomeveryrich