brand new and high quality Features: 1.Fully control of quality It's available for 8 kinds of data including PM2.5/PM1.0/PM10/HCHO/TVOC/AQI/TEMP/HUM, to ensure the for health of your family in all domains. 2.High Sensitivity Sensor - Built in PM 2.5 sensor, electrochemical sensor and TVOC sensor, it has high accurate testing. It's more precise than the general models in the market now. 3.Sound and Color Alarm Do real for time testing record and analyzed, hazard level with for Time Display. If exceed standard, prompt alarm and interface color changed, avoiding potential risk! 4.High-capacity Lithium Battery It can be charged via USB cable. Low battery alarm. And if there is no operation within two hours, the machine will close automatically. 5.Application Range: Home (Kitchen, Bedroom and etc.), Office, Car, Travel, Camping and Party, etc. Test the Quality anytime anywhere to be away from harmful of PM2.5, TVOC, HCHO, Haze and So On. Specification: Material: ABS Color: Black - Sensors are easily subjected by chemical substances, please keep it away from alcohol, perfume, gas, smoke when working - PM2.5 Sensor technolology: Laser Scattering - HCHO technolology: Electrochemistry sensor - TVOC technolology: Semiconductor sensor - ARM Processor: High-speed complex calculations - Temperature and Humidity sensor, detect temp, hum - Detection range: AQI(0-500) PM2.5(0-999 ug/M3) HCHO(0.001-1.999Mg/M3) TVOC(0.001-9.999Mg/M3) - Power supply:1500mah rechargeable Li-battery included Note:1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Package includes: 1 * Quality Detector 1 * Charging cable 1 * User Manual