Check the listing for details. Memphis Audio SBT4 Bluetooth Receiver Controller with Auxilary Input and USB. Condition: New. Listed at 126.65 USD. Memphis SBT4 Bluetooth controllers with AUX inputs give you maximum control of your audio system from a Bluetooth controller. Streaming and controlling your music has never been simpler. This unit features a high quality rotary dial which offers superior performance on the water or on the trails where conditions can be rough and bumpy. Enjoy multiple sources including Bluetooth, AUX & USB streaming/charging. An ultra-cool backlit LED knob illuminates in different colors to indicate which source is currently selected which elminating frustration when selecting between sources. The unit features 5V outpus and can be flush, surface or bar mounted. SBT4 Bluetooth Controllers feature a marine grade control for extended Bluetooth performance and range which can easily be hidden virtually anywher.