The Sansui PC-X 11 is a vintage audio cassette player/recorder. It was manufactured by Sansui, a Japanese company known for its audio equipment, during the 1980s. The PC-X 11 offers various features such as Dolby noise reduction, automatic tape type selection, and tape counter. It supports both recording and playback functions and is compatible with standard compact cassettes. The exact specifications and additional details about this specific model may vary.