The Denon DRR-680 is a cassette deck that features a variety of functions aimed at delivering high-quality audio playback and recording. It includes mechanisms for auto-reverse playback, which allows it to play both sides of a cassette without manual intervention. The device incorporates Dolby B and C noise reduction systems, ensuring that recordings have reduced noise and enhanced clarity. The front panel includes controls for play, rewind, fast forward, stop, and eject, along with a digital tape counter for easy navigation through tracks. Moreover, the deck is equipped with chrome and metal tape settings to optimize performance based on the type of tape in use, providing flexibility depending on user needs. The DRR-680 also integrates features such as a headphone output for private listening, and line-level outputs for connection to external amplifiers or mixers.