The ZTE Multiplex Device is typically a part of ZTE's telecommunications equipment, often used for devices like USB modems, routers, or mobile hotspots. The "Multiplex Device" might refer to the hardware that allows multiple types of data communication (e.g., 3G/4G/5G internet, voice, etc.) through a single interface.

In the context of Windows, the driver for this device enables your computer to communicate with the ZTE hardware, allowing you to use it for internet access, data transfer, or other functions the device supports. These drivers are often needed when you're connecting a ZTE device (such as a USB modem or dongle) to a Windows machine.