Description Features: *1. You can measure formaldehyde (HCHO), volatile organic compounds(TVOC) causing most odors, CO2, care about your familys health. *2. Temperature difference compensation calibration technology judges the ambient temperature data and automatically calibrates the test results for accurate measurement. *3. It can be connected to a power bank to monitor enclosed spaces, track the source of the contamination and remove it more accurately. *4. Long-term record, connect to your phone via to track HCHO/TVOC concentration trends. *5. It can be used in greenhouse plantation, farm indoor air detection, household air detection and so on. Description: *1. Power Supply: USB 5V *2. Blue: BT4.0 *3. TVOC Detection Range: 0~9.999mg/m3 (5-35C) *4. HCHO Detection Range: Temperature 5-35C, 0~9.999mg/m3 (5-35C) *5. CO2 Detection Range: 400-2000ppm (5-35C) *6. Temperature Detection Range: -10C~50C *7. Dimensions: 75 x 75 x 50 mm/3.0 x 3.0 x 2.0 *8. Weight: 74 g/2.6ounce Packing Includes: 1 x Air Quality Monitor 1 x USB Cable 1 x Manual