PRESET 200W AMP & SUB OUTPUT: This rv stereo receiver features 4x50W freaking loud Amp output (22Wx4 RMS) and RCA rear subwoofer audio output. Customed EQ settings (Pop / Rock / Jazz / Classic / Flat) on this multimedia marine system can match your different music styles. This boat radio also supports power-off memory and time display. DIGITAL MEDIA USB AUX INPUT: The bluetooth marine audio is ready a USB 2.0 port (Up to 64GB) and one pair of 3.5mm Auxliary input. Universal audio formats and ID3 MP3 tag reading are supported. This digital media marine unit gives you plenty of ways to enjoy music and lets you easily get the track and artist information. BLUETOOTH MUSIC & AM FM TUNER: This waterproof bluetooth radio is equipped with stable and wide range bluetooth for Spotify/Pandora music streaming from your bluetooth-enabled devices like smartphone, iPad, laptop, etc.. The bluetooth boat stereo supports AM FM with 30 stations memory, lets you freely tune and save your favorite music, sport, news, etc. radio stations. IPX5 WATER RESISTANT & WIDELY APPLICATION: This am fm boat stereo is outfitted with anti-corrosive UV coating and IPX5 water resistance, which stands up to dust, humidity and saltwater exposure. Great for marine and off-road environment. This marine head unit is standard gauge (tachometer) opening and required cutout: 2.89"(diameter) x 2.84"(depth), Ideal for boat, motorcycle, ATV, UTV, SUV, RV, Golf Cart, Harvester, Excavator, Pontoon etc. 2.8 INCH LCD DISPLAY & PHYSICAL BUTTONS: The marine bluetooth center is designed with 2.8 inch digital LCD screen with anti-foggy and anti-reflect technology, which lets you easy to see in all lighting situations. Illuminated buttons and a bigger rotary knob allow you to read and control the marine media receiver easier. Power supply requirement is DC 12V.