The input and output of this machine have 6.5mm 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 will 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*6.5 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 measurement allowed error is +/- 1-3cm.