The LNI-2 DC is a truly unique active DC filter with galvanic isolation, designed for use with DC power sources. It isolates, regulates, and filters the output signals from any 12-volt DC source, resulting in a remarkable improvement in DC stability. At the same time, it provides an ultra-clean 12-volt power supply. The result is absolutely impressive: an enhanced audio signal and significantly better sound quality without hum, buzz, or other noises that can be caused by power supplies or dirty mains power. And all of this comes in a compact and portable design.