The Hitachi D-W 700 is a dual cassette deck that allows for the playback and recording of cassette tapes. It features various functionalities such as Auto Reverse, which enables uninterrupted playback by automatically switching sides when a side finishes. The device is equipped with features aimed at enhancing sound quality, including noise reduction mechanisms. The design typically includes standard controls for play, record, pause, fast forward, and rewind operations. The D-W 700 can be connected to other audio equipment for a complete audio setup.