The Sony Ericsson Device 116 USB WMC Data Modem is a mobile broadband modem used for connecting a computer to the internet via mobile networks. It works by plugging into a USB port on your computer and provides internet connectivity through your mobile carrier's network (typically 3G or 4G). The "WMC" likely stands for Wireless Modem Connection, which is a common protocol used by mobile broadband devices to establish a connection between your computer and the mobile network.

To ensure your Sony Ericsson Device 116 USB WMC Data Modem works correctly, you need to install the appropriate Windows driver. The driver enables the operating system to recognize the modem, manage its connection, and allow your computer to use mobile data.