Capture the closed captioning text (CC1 through CC4) , information and then overlay it on the video output. If you want the option to stream the closed captioning out the serial port then you need the CC-101-PRO. The CC-101 is equipped with a serial port, through which the unit can display user defined text anywhere on the screen. The unit also has EEPROM (internal non-volatile flash memory) in which the user can store up to 10 strings of data and automatically display them either when the unit is turned on, or activate the playback via the front panel. Free Windows™ software is available that allows the user to define and store text in the unit’s memory for playback. The unit has both S-Video and Composite Video inputs and outputs.