[4 Channel Mixer]: Audio mixer has a built in digital effect processor with fast response. Professional output has better reverberation effect. [DPS Processor Chip]: Digital Mixer uses a high end DPS reverb processor chip, which is comparable to the music and vocal adjustment ability of an independent reverb. [Professional Microphone Vocal Reverb]: Professional Mixer, 7 band equalization pre delay etc. Powerful sound processing functions make your voice range wider and make it easier to make a good sound. Parameter: Inputs and Channels: 4-channel mono/mic input gain control High, mid and bass controls 1 stage auxiliary control 7-band equalizer 16 versatile digital reverbs Digital display MP3 USB interface recording function Bluetooth connection Independent microphone phantom power per channel Monitoring headphone volume control Independent mute for each channel Plug Type :EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Voltage: AC100-240V Note: Batch different, the appearance of differences, does not affect the use of Colour:Black Material:Iron Package Contents: 1 x Mixer 1 x Power Adapter 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.