Features: Passive Preamp/Speaker Volume Controller:It needs no external power supply to work--plug and play. Small Body:Ultra-compact controller, made of solid durable metal housing, is space-saving, easy to carry. High Sound Quality:Stable, lossless transmission ensures pure, sound with no noise. Easy Control:Front panel has switch to select fully-balanced or single-ended input/output; back has RCA & XLR interface. Wide Application:The device can connect with audio equipment that has no volume adjustment, very suitable for stereo system. Specifications: Material: Metal + Electronic Components Color: Black Input: 2-Channel Output: 2-Channel Connector: XLR, RCA Impedance: 10K - 50K Item Size: 145*65*43mm / 5.70*2.55*1.69in Item Weight: 320g / 11.28oz Package Size: 200*180*55mm / 7.87*7.08*2.16in Package Weight: 420g / 14.81oz Note: Volume controller and cable only, other accessories in the pictures are not included. Due to lighting or other reasons, the picture and material object may slightly differ. Due to manual measurement, there may be deviation, please in kind prevail. Packing List: 1 * Volume Controller 1 * Cable