You can measure CO2 levels, care about your family's health. Temperature difference compensation calibration technology, judge the ambient temperature data, automatic calibration test results. Long-term record, tracking formaldehyde /TVOC concentration trend. It can be used in greenhouse plantation, farm indoor air detection, household air detection and so on. USAGE: this air quality tester is designed to get an overview of the air quality in a home, workplace, school, a daycare centre or any other location POWER SUPPLY: air quality tester is powered by 5V USB charing, can be connected to mobile power to check the sealing space SUPPORT APP: our carbon dioxide detector is Compatible with Android iOS System, View data remotely Features Air quality meter -Color: White. -Material: ABS. -Size: 7.5x5 cm/2.95x1.97 inch. Power supply: USB 5V Connection mode: Wireless 4.0 Supoorts iOS 9.0 or above/Android 4.3 or above TVOC detection range: temperature 5-35C, 0~9.999mg/m3 Detection range of HCOC: Temperature 5-35C, 0~9.999mg/m3 CO2 detection range: temperature 5-35C, 400-2000ppm Temperature detection range: -10~50C Packing list 1 * Air quality meter