Description: With four 3.5mm inputs 3.5mm output, the stereo mixer is capable of mixing signals from CD players, musical instruments, portable recording equipment, video playback equipment and more. Small and complex; The stereo mixer runs on external USB power and is easy to use. 1 main output volume knob and 4 input volume controls, 4 inputs do not interfere with each other. Provides the highest sound quality even at the maximum power level. Specifications: Material: Metal + Acrylic Size: . 8.5X5.6X4.2cm/3.35x2.2x1.65 inch Color:Black+red Output Parameters: Type:3.5mm connector lmpedance:min..80 Max.output level:+16 dBu Inputs Parameters: Type:3.5mm connector Impedance:min.4.7 k Maxinput level:+16 dBu Power Supply:external power supply,5 V---21500 mA Power Range USA/Canada:120 V~60 Hz China: 220V~50Hz U.K./Australia: 240 V~,50 Hz Europe: 230 V~50Hz Japan:100V~50/60Hz Package Contents: 1 x mixer 1 x USB power cable 1 x English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.