four channel mixer, system for studio recording, DJ equipment, live online, etc. can be used outdoors and indoors, portable and convenient to use. Use of USB input to connect devices to play MP3, MP3 part with volume control. 3-band EQ on all channels, HI controllers high frequency range, medium control increases / cuts midrange frequencies, and low control increases / decreases the gain of the bass range. Built-in reverberation delay effect, 48 V phantom power supply and BT function. Colour: Black Material: ABS Package Contents: 1 x audio mixer 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.