It has long service life and can be with USB cable. The battery can be for more than 3 hours for 5-6 hours. Intelligent color screen display, clear numbers, easy to identify and read. Real time monitoring and real-time display of carbon dioxide concentration per cubic meter. 3 IN 1: CO2, temperature, humidity. In alarm mode, the user is prompted to pay attention to the environment by changing the color. It can detect and display the temperature and humidity of the environment to help users understand the environment. It is small and portable, easy to carry, does not occupy too much space, and can be installed . It is suitable for offices, families, gymnasiums and other occasions, and has a wide range of applications. When charging, the battery indicator flashes all the time. When the battery is full for more than 3 hours, the indicator also flashes when the battery is full. Type: CO2 Detector Measurement accuracy: 1ppm Measuring range: 400-6000PPM Working voltage: 3.7V Current: 160mA Power: 0.6W Battery: 3.7V, 1500mah Charging time: 3 H Working time: 5-6H Control mode: bluetooth APP Functions: 1. bluetooth app reads the data stored for 60 days. 2.Store 1440 sets of data for 60 days. Colour:black Material:ABS Size:89 x 70 x 35mm Package Contents: 1 x CO2 detector 1 x USB cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.