new and high quality! Audiophile-grade operational amplifier, balanced amplifier circuit composed of NE5532. This machine is suitable for audio signal mission amplification, and can also be used as a high-fidelity dynamic microphone amplifier. Input interface: XLR female, impedance 10K; Output interface: XLR male, impedance 100 ohms; Gain: unbalanced 20db, balanced 26db; Working voltage: between DC5V-12V; Power consumption: 0.5W; Working frequency: 20HZ-20KHZ Colour:Black Material:Metal Package Contents: 1 x XLR balanced amplifier 1 x USB power 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.