Features:Phone Monitor APP: support Android and iOS phone, view data remotelyTemperature difference compensation calibration technology, evaluate ambient temperature data, automatic calibration of test results. You can measure CO2 levels, take care of your family's health. Locate the source of the contamination and test it more thoroughly. It can be connected on mobile power to check the sealing space. Long-term record, tracking the trend of formaldehyde/TVOC concentration. Can be connected to a power bank, more reliable for detecting limited spaceFind the source of pollutionIt can be used in greenhouse plantation, household air detection, household air detection and so on. Specifications:Power Supply: USB 5V Connection Mode: Bluetooth4.0TVOC Detection Range: Temperature 5-35c, 0 - 9.999mg/m3HCOC Detection Range: Temperature 5-35c, 0 - 9.999mg/m3CO2 Sensing Range: Temperature 5-35C, 400-2000ppmTemperature Detection Range: -10 - 50cProduct Size: 75*75*50mm/3.0*3.0*2.0inProduct Weight: 74g/2.6ouncePackage Size: 116*95*56mm/4.6*3.7*2.2inPackage Weight: 110g/3.9ouncePacking List:1*Air Quality Tester,