R3500 Stereo Receiver AM/FM/BTEngineered for the Ultimate Sound Experience.  Infinity's all new marine source unit, the JBLR3500, is engineered to withstand sun, salt, UV, and intense thunderstorms.  If you're looking to invest in reliable audio, invest in a radio that doesn't require a 12V Master's degree to understand.  The Infinity audio brand has stood the test of time and we are proud to launch this JBLR3500 as the opener of the all new WAKE series.Features:Tuner - Understanding the need to listen to the ballgame, talk radio, or your favorite radio pop station, this source unit was thoughtfully engineered to master AM, FM and WB2 Ohm Stability - If you’re looking to add additional speakers, such as 4 hardtop speakers to your existing 4 interior speakers, the R3500's 2 ohm stability will allow you to do just that. And no need to purchase an additional amplifier to do soRear amplifier plugBT5.0 - While lesser stereos integrate older BT technology, the JBLR3500 incorporates BT5.0. BT5 allows two boaters to connect at the same time, allowing multiple users to take turns playing tunes. BT5 also transfers data faster and has a greater range than BT4.2USB Input -  With USB input, play your favorite mp3 and wma tracks via a USB drive. In addition, this port can also be used to charge your smartphone, which means not missing an important phone call or your tunesPre-outs- With a set of pre-outs (Left and Right), expandability is on your horizon. Add an amp or a subwoofer for additional performanceReliability Testing - The R3500 undergoes a testing process that leaves the competition in its wake. From sun to salt to thunderstorms to overturned soda, we test so that you enjoy your music all dayCover NOT included*Sold as an Individual