The OSSC-BLE is created to use the firmware from the original OSSC by Markus Hiienkari. The OSSC-BLE only has one component connector set and one stereo audio set. There are two headers for a stacked board to drop on top and provide the additional audio and video input connectors. This reduces the footprint space while still allowing all connectors to face the same direction. The connector locations had an extruded aluminum housing in mind. The headers connect to the flash and I2C to allow an external MCU to inject modified code.