Marine digital media receiver (does not play CDs).  Built-in Bluetooth for music streaming. 2-3/4″ color LCD display (JBLPRV275 ONLY). Built-in amp (20 watts x 4 RMS/45 peak x 4 channels). Marine-rated watertight face. Rotary encoder knob. Fits into a standard tachometer opening. Inputs: rear USB input, rear aux input. Outputs: 3 sets of RCA preamp outputs. Face diameter: 4-1/8″. Required cutout: 3.375″ (diameter).