SM Pro Audio Nano Patch Plus Silver - passive volume control, compact desktop size, suitable for stereo signals from soundcards, CD players, preamps, and mixers, designed to allow precise level adjustments from analogue audio source material. Features balanced combo (XLR/TRS) & 3.5mm TRS mini-jack inputs, 1/4" TRS jack & 3.5mm mini-jack outputs, mute switch and large sized rotary volume knob.