Denon professional brand recorder, features of the recorder: Working, operates efficiently. . Features include dual playback and recording. . Auto-reverse. . Sound speed control (accelerated) or slow. In addition to high copying speed. Professional audio features: Includes Dolby B/C noise reduction system, HX Pro system for recording enhancement, in addition to a microphone input and microphone mixing. Device condition: There is a whistling sound during playback, I expect it only needs minor maintenance, but overall the device is working and all functions are working well. Contact via private message