With the TVOC sensor, it can detect the TVOC in the environment and understand the environment better. After receiving the tester, the data cannot be detected immediately. Please place it in a ventilated place for about 15 minutes and wait for the tester to stabilize the statistics. Real-time monitoring and real-time display of carbon dioxide concentration per cubic meter.If the data tester are abnormal, the battery may be too low. Please charge the tester or use it while charging. It can be used continuously for five hours after being fully charged. If you want to use it all the time, the tester should be connected to the power supply all the time. This detector is small and portable, it can clearly display HCHO and CO2 concentration, temperature and ambient humidity, suitable for office, home, gym and other usage scenarios. It can detect and display the environment temperature and humidity to help users understand the surroundings. With alarm mode, color change allows users to pay attention to the surroundings.