The Sony Ericsson Device 039 USB WMC OBEX Interface driver is used for connecting Sony Ericsson mobile phones (or other devices) to a Windows computer via USB, enabling the transfer of files between the phone and the computer. The WMC OBEX (Object Exchange) protocol is commonly used for exchanging files over Bluetooth or USB, and the USB WMC OBEX Interface driver ensures that Windows can communicate properly with the device when connected via USB.

This driver is typically used with older Sony Ericsson phones for tasks such as transferring media files, managing contacts, and using the phone as a modem. It is part of the Sony Ericsson PC Suite or Sony Ericsson Bridge for managing mobile devices.