The Sony Ericsson Device 1039 USB WMC OBEX Interface Windows driver is a software package that allows your Windows computer to interact with a Sony Ericsson mobile device, typically a feature phone or smartphone from the Sony Ericsson brand. The "WMC OBEX Interface" refers to the Wireless Modem Communication (WMC) and Object Exchange (OBEX) protocols, which are used for transferring data between the mobile device and your computer. OBEX is a protocol used for exchanging binary objects, such as files or contact information, between devices.

This driver would be necessary for tasks such as:

• Transferring files between your Sony Ericsson phone and your computer.
• Synchronizing contacts, calendar events, or other data.
• Using your phone as a modem to access the internet via USB (tethering).