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WS-7 video capture card has two external pins - D-SUB-9 and D-SUB-25. D-SUB-25/BNC interface cable is used for simultaneous connection of 4 cameras to the external D-SUB-25 pin of WS-7 video capture card. D-SUB-9/RCA interface cable is used for simultaneous connection of 4 audio channels to the external D-SUB-9 pin of WS-7 video capture card.