With its backlit auxiliary port on the front, the Kenwood DPX503U car radio can be hooked up to a whole load of portable devices. Its powerful sound output of 4 x 50W, thanks to an integrated MOSFET amplifier, means that the DPX503 will blast out music from your MP3 player or your external hard drive. The DPX503U uses the ES system, which combines a highpass and lowpass filter for deep bass and dynamic harmony. This system limits distortion to bring you excellent quality sound. The Kenwood DPX503U also has two RCA connectors you can easily add speakers or a subwoofer to your incar audio system. Plus with Bluetooth and iPod compatibility, optional adapters, the DPX503U will provide the soundtrack to all your journeys.