Fangrui Product Details The Input And Output Of This Machine Have 3.5mm Interfaces, With 48v Phantom Power Supply, Supporting Common Condenser And Dynamic Microphones; The Input Xlr Is Balanced, 3.5 And 6.5 Are Unbalanced, And The Three Output Interfaces Are Balanced And Compatible With Unbalanced Output; Output Wiring Chooses The Appropriate Package Option According To Your Own Equipment; The Dc Power Supply Range Is Between 5v-12v, And Can Be Powered By A Power Bank Or A Mobile Phone Charger (please Use A High-quality Charger, Poor Quality Have Ac Noise), Or A 12v Power Adapter. Amplification Gain: 60db; High, Medium And Low Frequency Adjustment Range 15db; Working Frequency: 20hz-20khz; Power Consumption: About 0.6w Colour: Black Material: Metal+plastic Package Contents: 1*balanced Dynamic Mic Amplifier 1*3.5 Audio Cable 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 Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.