About This 【Know Your Air】: This 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] 【Live Data on APP】: Requires a GW1100 Wi-Fi gateway(sold separately) to connect to WiFi, after the WIFI 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 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 WH41 PM2.5 Air Quality Sensors. Note: Please download the latest WS View Plus App and update the firmware to V1.4.6 to add multi-channels sensors; each new sensor will be recognized as a new channel according to the Power-on sequence. 【Indoor & Outdoor Air Quality Detector】: IPx4 weatherproof design, suitable to use at home, office, car and other environmental testing; monitor the air quality anytime anywhere to be away from harmful of PM2.5. Overview Brand : ECOWITT Style : WH41B Power Source : Battery Powered Color : WH41B Alarm : Audible Material : Plastics Unit Count : 1.0 Count Manufacturer : ECOWITT
