Feature: 1. 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. 2. Adjust the volume--each channel input has its own volume adjustment; rotate rotary knobs to easily control volume level. 3. Adopt good material--made of metal housing, it is solid, durable; black coating resists rust; there are non-slip silicone pads on the bottom. 4. Take it to anywhere--lightweight and compact audio mixer, smaller than the palm, saves space, allows easy carry. 5. Offer high sound quality--featured with low noise operational amplifying circuit, it performs well, delivers clear sounds with no distortion. Specification: Material: metal + electronic components Color: black 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 . Package List: 1 * Audio Mixer 1 * Power Adapter 1 * User Manual Note: Audio mixer only, other accessories in the pictures are not included. Please read the user manual carefully for more information, before usage. 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.