The Akai CS-F 11 is a cassette tape deck manufactured by Akai. It is a compact and portable device that was released in the 1970s. It features a stereo cassette player/recorder with playback and record functions. The CS-F 11 has a built-in microphone, headphone jack, and an input for external microphones. It also has basic audio controls such as volume, tone, and balance adjustment. The device is powered by batteries or can be plugged into a power outlet. It is designed for personal use and offers a convenient way to listen to and record audio on cassette tapes.