Pioneer's DEH-S6000BS Single-DIN In-Dash CD Receiver with Bluetooth includes three pairs of RCA preamp outputs and a stunning illuminated rotary knob. The head unit also has a 50 watt x 4 built-in MOSFET amplifier and a 13-band EQ. The RCA preamp outputs are for front, rear and subwoofer, making it easier to add an optional amp. The units USB port can be used for charging electronics like cell phones and can also be used for Android Music and iPhone/iPod audio or control. You can stream your favorite music with Pandora or Spotify. Access music on your smartphone directly from the Pioneer receiver. Search for Artist, Albums and Songs using Pioneer's intuitive interface. With Pioneer receivers you can also access and control select music and radio apps on your smartphone.