This is a versatile preamplifier compatible with multiple microphones, featuring three common input/output interfaces for excellent adaptability, and built-in 48V phantom power supply. HIGH GAIN: Mic preamplifier enhances your sound experience with balanced amplification circuitry with 38db gain, providing clean, transparent gain. LOW NOISE: Microphone preamp features a , fully balanced circuit design that produces ultra low noise and clean sound, ensuring minimal noise and adding no coloration to your recordings. METAL CASE: Dynamic condenser microphone booster's black metal casing is not only rugged, but also low noise by effectively eliminating most EMC interference. Specification: Item Type: Microphone Preamp Interface & Knob Functions: MIC IN: Microphone input ports (3.5mm, 6.5mm, XLR ); MIC OUT: Microphone output ports (3.5mm, 6.5mm, XLR ); POWER: Power switch; 48V: Phantom power switch; GAIN: Gain adjustment knob (maximum 38dB); DC5V: DC power supply interface; Power Consumption: 0.2W (when 48V off), 1.8W (when 48V on); Frequency Response: 20Hz-20kHz; Total Harmonic Distortion (): 0.0023%; Input Impedance: Balanced XLR/6.35mm at 1.5K; Output Impedance: Balanced 250. 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.