Features:it can detect TVOC in the environment and better understand the environment.Real-time monitoring and real-time display of carbon dioxide concentration per cubic meter.It can detect and display the temperature and humidity of the environment to help users understand the environment.It is suitable for office, family, gym and other occasions, with a wide ranges of applications.Intelligent color screen display, the number is clear, easy to identify and read.With alarm mode, users are prompted to pay attention to the environment.It has long service life and can be charged with USB cable.Small and portable, easy to carry, does not take up too much space, can be installed in the homeSafe range:a.CO2: 350~2000 ppmb.TVOC: 0.000-2.000mg/mc.HCHO: 0.000-1.000 mg/md.temperature: 0~90e.humidity: 0~99%RHPacking List:1 * Detector1 * USB Cable1 * ManualNote:The product is sealed and shipped for 7 to 15 days, because there are perfume and other gases in the box.Afterreceiving the product, you need to stand for 1 hour, wait for theabnormal gas to volatilize, and start normal measurement;Inaddition, if the sensor is heated for more than 2 hours, thetemperature measurement will be 2 to 3 degrees Celsius higher than thenormal temperature. This is a normal error. If it is unacceptable,please do not buy it, thank you