The DN-500CB is an extremely versatile yet affordable media player that is ideal for applications where users bring their own devices for education, teaching or entertainment. The DN-500CB not only plays CD media, but also offers Bluetooth connectivity, USB playback and a 3.5mm AUX input for connecting virtually any other playback device. Like all Denon Professional 500-series media players, the DN-500CB offers an RS-232c port on the rear panel for serial command control. The serial command protocol manual can be downloaded. This player is particularly well suited to retail, education and hotel / conference applications and offers features normally found on higher priced players such as and balanced XLR output.