Regarding the technical side, how it is organized I can not say. I know that the BATT connected to a battery, the speaker displayed on the E398, two SD cards are connected, if you open a connector for the original flash drives, there is visible plume is passing through this slot (as I understand it connects the card reader for the SD card reader and original). More under the cover connector for speakers launched by Sony Ericsson.
1 - connector for speakers
2 - Accum
3 - speaker
4 - stick