The professional microphone enhancer is an active built-in preamplifier that is inserted between the preamplifiers of passive ribbon or dynamic microphones. +28DB gain: The amplifier circuit has low noise, which is a good solution to the problem of low microphone volume due to low sensitivity. The CLASS-A amplifier circuit design is used, and the high-order transistor MP5+ has a lower audio output impedance and a stronger load capacity. Simple connection, plug and play: just plug the microphone amplifier into the microphone's XLR output port. This amplifier is only suitable for wired dynamic microphones connected to 3.5MM jack sound cards, and only requires 5V power supply. Frequency range: 20Hz-20KHz Gain: 28dB Signal-to-noise ratio: 3.0mA Connector: XLR three-pin male/female Power supply: 5V power supply Impedance: 135 Ohms Recommended impedance load: 1k Ohms Current consumption: is 110B Sampling rate: 24-bit/48kbps Audio Maximum output level 9uv(A) Maximum input level: 8.3dBV/2.6V(0.5%@1kHz) Different batches may have different silk screen printing, which not affect the use Colour:Black Material:Aluminum Alloy Package Contents: 1 x Microphone Amplifier 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.