Features: Mix 4 audio inputs--audio mixer can connect 4 devices(like keyboard instruments etc.) to 1/4-inch TS connectors mix down 4 signal inputs into 1 signal output. Adjust volume--each channel input has its own volume adjustment; rotate rotary knobs to easily control volume level. Adopt good material--made of metal housing it is solid durable; black coating resists rust; there are non-slip silicone pads on bottom. Take it to anywhere--lightweight and compact audio mixer smaller than palm saves space allows easy carry. Offer high sound quality--featured with low noise operational amplifying circuit it performs well delivers clear sounds with no distortion. Specifications: Material: metal + electronic components Color: black Adapter: input--100-240V output--12V/1A Interface: 1/-inch TS connector Input Impedance: min. 4.7kΩ Max Input Level: +16 dBu Output Impedance: approx. 80Ω Max Output Level: +16 dBu Item Size: approx. 46.5*57.2*103.6mm / 1.83*2.25*4.07in Item Weight: 370g / 13.05oz Package Size: 14*9.5*7.5cm / 5.51*3.74*2.95in Package Weight: 305g / 10.75oz Note: Audio mixer only other accessories in pictures are not included. Please read user manual carefully for more information before usage. Due to lighting or other reasons picture and material object may slightly differ. Due to manual measurement there may be deviation please in kind prevail. Packing List: 1 * Audio Mixer 1 * Adapter 1 * User Manual