The Yamaha KX-670 is a dual cassette deck that features sophisticated technology and design aimed at providing quality playback and recording options. It operates on a two-head system for each deck, allowing for efficient recording and playback. The KX-670 incorporates features such as automatic tape type detection, which optimizes performance based on the tape used. It also includes a variety of playback modes, including high-speed dubbing, allowing for quick and easy tape copying. The front panel is equipped with easy-to-read LED displays that provide information about the playback status. Users can find convenient features like a soft-touch control system for ease of operation, along with a headphone jack for personal listening. The device supports both normal and metal tapes, enhancing versatility in media playback. Additionally, it features a memory rewind function and auto shut-off capabilities, making it user-friendly. The Yamaha KX-670 is designed with a robust build, ensuring durability and longevity, typical of Yamaha's construction standards.