The Sony Ericsson Device 115 USB WMC Device Management is a driver that was used for managing and interacting with Sony Ericsson mobile phones, particularly in the context of Windows Mobile Communications (WMC). It typically facilitated features such as syncing contacts, managing files, and transferring media between the phone and a PC, often when the phone was connected via USB. This driver was commonly used when connecting Sony Ericsson phones (like the Xperia or older Sony Ericsson models) to a PC for management tasks.