The Portable Air Quality Monitor FS11006AC is an integrated Class 6 environmental sensor (measuring temperature, humidity, PM2.5, CO , TVOC, and particulate matter) and an intelligent air quality detection and fresh air system linkage controller. It supports RS485/WIFI communication and the Modbus RTU protocol. The product features a built-in three-speed fan control interface, enabling real-time coordination with fresh air systems to adjust fan speed. It is suitable for smart buildings, public spaces, and industrial environments.