Description:This is a real-time PM2.5 air quality monitor instrument used to monitor the concentration of PM2.5 in the indoor/outdoor environment. It features clear LED display screen to indicate PM2.5 pollution level. Very good and helpful for environmental protection. Suitable for home, office, outdoor, car and other places use. The super mini pocket design that can carry around and detect anywhere you like. An ideal multi-function testing tool to monitor the air quality, a safeguard for family health.Features:Digital LED display screen shows the testing results, easy and clear to read.Accurate to detect PM2.5 in air with advanced laser detection sensor technology in real time.Easy to carry with the super mini pocket size and light weight - monitor air quality wherever you are.Built-in large capacity battery, long standby time. Continuous work over 4.5 hours with USB cable charging function.Alarm function: when the detected result over the setting value, the result will blink in red to alarm. (alarm setting: short press SET to set he alarm, display shows the current alarm value.)Auto power off: it cannot be power off automatically 30 minutes without any operation.Temperature/humidity meter: it also can measure indoor/outdoor temperature and humidity.Application: suitable to use at home, office, in the car, outdoor and other environmental testing.Specification:BrandSNDWAYPM2.5 Measuring Range0~500g/mSingle Response Time<1sComposite Response time10sResolution Rate 1g/mCounting Efficiency of Particulate Matter50%@ 0.3m 98%@ 0.5mMass Concentration Consistency of Particulate Matte10% @ 100~500g/m; 10g/m@ 0~100gTemperature Measuring Range-10.0~50.0Temperature Accuracy 0.3Humidity Measuring Range0%~99%RHHumidity Accuracy3%RHPM2.5 SensorLaser Particulate Matter SensorWorking Time for Once Charging>4.5/hChargingDC5V 500mA USB ConnectorBatteryLi-ion Battery 580mAhProduct Size(appr.)60 * 60 * 26mm / 2.4 * 2.4 * 1.0inchPackage Weight(appr.)184gPackage Included:1 x SW-825 PM2.5 Detector Meter1 x USB Cable