MB Quart OFF-ROAD & Marine Multimedia Source Unit with 160 Watt internal amplifier features AM/FM/Bluetooth. Technical Specifications: Source Unit Tuner Section FM Stereo Frequency Range: 87.5MHz - 108MHz Source Unit Tuner Section S/N Ratio:> 55dB Source Unit Bluetooth Range (ft): 32 (10m) Source Unit RMS Power Output (watts): 4 x 20 Source Unit Peak Power Output (watts): 4 x 40 Source Unit S/N @1W: 81.2dBA Source Unit Frequency Response (Aux In): 85Hz - 20KHz Source Unit Pre-amp Outputs (Y/N #): 2pr - Front/Rear Source Unit Pre-amp Voltage: 4V Source Unit Minimum Impedance (ohms): 4 Source Unit Display Type: LCD Source Unit Display Backlit: Yes Source Unit LCD Font Size: Medium Source Unit Dimensions Mounting Hole (in): 3 Source Unit Dimensions Total Mounting Depth (in): 4.1 Source Unit Dimensions Mounting Bezel (Round) (in): 4.1 IPX Rating: IP67