5x Trinniti Eurorack Synthesizer Modular Plug Lights - LED Jack Light 3.5mm 1/8 inch 12 volt Visualize the output voltage of a module - Red/Blue/Purple Specifically made for the Eurorack +/- 12 volt standard Rubber grip with logo 3.5MM (1/8 INCH) mono plug HAND MADE in the United States by Trinniti