Switchable US & Europe Tuner Frequencies allow you to take the BV7348B outside of the US and pick up European frequencies so that you can enjoy your music abroad. A 3.2-inch widescreen TFT digital monitor is built into the faceplate for your viewing pleasure. “RDS”, which stands for “Radio Data System,” allows FM broadcasters to send far more than just an analog audio signal out over the air waves. Using a 57 kHz “subcarrier,” stations can transmit digital RDS data for reception by RDS-equipped FM tuners. Depending on what the broadcaster transmits and what your tuner can pick up, you can receive information such as the name of the artist/song, name of the station, genre, traffic information and more. The Front AUX-In is a little input in the front of the BV7348B and is an interface that allows the input of audio signals for MP3 players, headphones and portable music players. It is for AUDIO ONLY and not video. The BV7348B has 80 Watts of Output power and offers 4 channels that can be used to hook up 4 speakers.