View larger GENERAL FEATURES 1. Front AUX (Auxiliary) InThis input in the front of the 506UA that says “AUX” 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.2. Output Power: 50 Watts x 4 ChannelsThe 508UAB offers 4 channels that can be used to hook up 4 speakers. Typically though, it is a much better practice to have an amplifier running your system.3. Switchable US & Europe Tuner FrequenciesThe 506UA will not only be able to pick up U. S. frequencies but it will also have the capability to pick up European frequencies. PLAYBACK 1. CD±R/RW Audio2. MP3 INPUTS & OUTPUTS RCA Outputs View larger Compatible With Audio Output of iPod / iPhone, Smartphones and MP3 Players You can connect a device that has an Auxiliary output, such as your iPhone/iPod, smartphone and MP3 players straight into the Auxiliary input of your head unit. So basically a cable that has (2) 3.5mm audio (male) plugs.Important: Please beware that this feature is not the same as the “Full iPod Control”.This feature will only allow you to control your music by clicking on the designated buttons via the face or front side of your unit. Remote Control View larger USB Port View larger SD Memory Card Port View larger