The Sony Four-Track Cassette Player/Recorder is a four-track cassette player and recorder designed for use by individuals who are blind or have low vision. Features include variable speed playback, an external speaker, headphones, a microphone jack, and a tape counter. It will not erase tapes. It comes with a carrying case. POWER: Uses two double-A batteries (included). DIMENSIONS (HxLxW): 1.25 x 3.25 x 4.375 inches.