4.3 inch digital LCD display Air quality monitor test PM2.5 HCHO/TVOC AQI indoor gas detector Specifications Support for time and date, history, self-calibration function. Display method: 4.3" LCD screen display, 320 x 240 pixels Atmospheric pressure: 86Kpa - 106Kpa Detection method for PM: laser-scattering Sampling time: 1.5 seconds Product Size: 145*78*97.2 MM Detection temperature: -10C to 50C; 14F to 122F Relative humidity: 20% - 85% Storage temperature: -10C to 60C; 14F to 140F Concentration unit for HCHO and TVOC: mg/m Detection range: AQI(0-500), PM2.5 ( 0-999 ug/M3 ), HCHO(0.001-1.999Mg/M3 ), TVOC(0.001-9.999Mg/M3 ) Power source: Lithium battery with 1000 mAh capacity; 5V for DC power charging via micro USB port Product weight: 300g Description This product is a multifunctional air quality detector that detects Formaldehyde (HCHO), Total Volatile Organic Compounds (TVOC), Particulate Matter