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: Brand SNDWAY PM2.5 Measuring Range 0~500μg/m³ Single Response Time <1s Composite Response time ≤10s Resolution Rate 1μg/m³ Counting Efficiency of Particulate Matter 50%@ 0.3μm 98%@ ≥0.5μm Mass Concentration Consistency of Particulate Matte ±10% @ 100~500μg/m³; ±10μg/m³@ 0~100μg Temperature Measuring Range -10.0~50.0℃ Temperature Accuracy ±0.3℃ Humidity Measuring Range 0%~99%RH Humidity Accuracy ±3%RH PM2.5 Sensor Laser Particulate Matter Sensor Working Time for Once Charging >4.5/h Charging DC5V 500mA USB Connector Battery Li-ion Battery 580mAh Product Size(appr.) 60 * 60 * 26mm / 2.4 * 2.4 * 1.0inch Package Weight(appr.) 184g Package Included: 1 x SW-825 PM2.5 Detector Meter 1 x USB Cable