About This 【 Know Your Air】: this air quality sensor measures PM2.5 concentration in the air(with high quality HPM Series Particle Sensor) and allows you to take timely measures to keep the air quality within safe levels[Accessory Only, Can Not Be Used Alone] 【Indoor Air Quality Detector】: Indoor Air Quality Detector: powered by USB connection(USB cable included), suitable to use at home, office and lab; monitor the air quality to be away from harmful of PM2.5; Also works with HP2551/HP2553 weather stations (sold separately) 【Live Data on APP】: requires a GW1100 Wi-Fi gateway(sold separately) to connect to Wi-Fi, after the Wi-Fi configuration, the current PM2.5 concentration / real-time and 24 hours average AQI / air quality levels indicator(Good, Moderate, Poor, Unhealthy, Severe and Hazardous)can be viewed directly on the WS View Plus or Ecowitt App. Graph & History Records on the Website: supported to upload to our free Ecowitt Weather server(ecowitt.net) to view the PM2.5 and AQI data graph and download the history records on the website; it's recommended to add a shortcut of the website on the home screen of your phone for quick access 【Support Monitoring Multi Locations】: The GW1100 Gateway(sold separately) supports MAX 4 WH43 PM2.5 Air Quality Sensors. Note: The WH41 and WH43 will be recognized as the same sensor type by the software. If you purchased both, they will share the four channels together and the total quantity. 【NOTE Between the WH41 and the WH43】: The software recognizes the WH41 and WH43 as the same sensor type. If you purchase both, they will share the four channels, and the total number of sensors cannot exceed four. Overview Brand : ECOWITT Item Weight : 4 Grams Style : WH43B Measurement Accuracy : ±15% (for >100ug/m3), ±15ug/m3 (for
