SOURCE UNIT Rotary volume control AM/FM multi region tuner Bluetooth audio streaming w/ easy pair Rear AUZ & USB (charge & flash drive) 2-pair preamp outputs EEPROM virtual memory 50 watts x 4-Ch amplifier built in RMS Power: 25 x 4 Peak Power: 50 x 4 Cut Out Diameter: 3.6 The MXA1MC is a powerful gauge style media center designed to fit into standard gauge openings and engineered to be water and element resistant making it perfect for marine and powersports applications. The MXA1MC is a Bluetooth-enabled device allowing you to stream and control your music on your boat or side-by-side with your phone safely put away. In addition to Bluetooth, this unit features an AUX input and USB thumb drive input and an AM/FM radio tuner depending on your preference. The MXA1MC features a built in 4x50watt amplifier to power your audio system along with 2 pair of pre-amp outputs to add additional amplification for larger systems. Combine the MXA1MC with the MXA1MCR remote to add additional control in multiple locations on your side-by-side or boat. A great audio system starts with the perfect controller, the MXA1MC is a versatile and powerful solution that is reliable and simple to control so you can bring your music with you anywhere.??