The smallest cassette recorder at the time, designed for an optimal balance of compactness, recording performance, and reliability. What helped make it the world's smallest was a combination of features: integrated circuits, compact component mounting, and a newly developed built-in mic. The TC-50 was conceived as a recorder for taking dictation with one hand. A simple design makes the most of the natural beauty of the aluminum, and the dazzling reflection of light off the internal mic is also memorable. The popularity of this recorder took off when it was used by astronauts on the Apollo 7 space mission.