The Sony Ericsson Device 089 USB WMC OBEX Interface driver is used to enable communication between a Sony Ericsson mobile device (identified by Device 089) and a Windows computer via USB. This driver typically supports Windows Mobile Communication (WMC) and OBEX (Object Exchange) protocols, which facilitate the transfer of files (such as pictures, music, contacts, etc.) and other data between the mobile device and the computer.

• WMC (Windows Mobile Communication): Refers to the communication framework used to sync data between Windows Mobile devices (or similar Sony Ericsson phones) and Windows PCs.
• OBEX (Object Exchange): A protocol used to transfer objects (like files or contacts) between devices, typically through Bluetooth or USB. In this context, OBEX allows for easy file transfers, such as images or documents, from the phone to your computer.

This driver might also enable additional functionalities like the use of the phone as a modem (for mobile internet), synchronization of contacts, and management of multimedia files between your Sony Ericsson phone and the PC.