Retro Portable Tape Recorder, circa 1975. Uses cassettes. Typically operated with 4 batteries or external power adapter for mains supply. Cassettes typically lasted 30 or 45 minutes per side. Manufactured in Japan for North American markets, used some IC chips in circuitry, along with transistors. Had microphone built-in, but external microphone could be connected.
Openclipart
SunKing2