The Sony Ericsson Device 115 USB WMC Data Modem is a USB modem used for data communication, typically via 3G or 2G mobile networks, in devices like mobile phones or data cards manufactured by Sony Ericsson (now part of Sony Mobile). The "WMC" in the name stands for Windows Mobile Communication, indicating that the device is designed for use with certain Sony Ericsson phones or other mobile devices, often to enable internet connectivity through mobile data networks (e.g., 3G or GPRS).

The Sony Ericsson Device 115 USB WMC Data Modem driver is the software that allows your Windows PC to communicate with this mobile data modem. It provides the necessary functionality for establishing mobile data connections and may also enable other services, such as SMS or mobile device management.