The FH-S520BT is a double-DIN CD receiver with built-in bluetooth allowing you to control your compatible smartphone device wirelessly. This double-DIN receiver is compatible with the Pioneer Smart Sync allowing you to utilize your smartphone functions by pairing the application to the receiver. This application supports safe usage of your smartphone while in your vehicle. You can call applications with one touch button on the receiver. It also helps you by reading your messages instead of being distracted while driving. Instead of the normal 13-band equalizer, this application offers 31 band EQ, time alignment, sound effects, and much more. It is equipped with 3 sets of 2V preamp outputs for the front, rear and subwoofer.