Summary: 1. With digital display stereo MP3 input.  2. Bluetooth function.  3. 48V fantasy power supply for condenser microphone.  4. Built-in digital effects.  5. Five-segment effect level monitor indication.  6. Seven-band stereo equalization.  7. Recording input with stereo function.  8. Low noise microphone input with interface.    Feature: 1.Built-in 48V Phantom power for confenser microphones use professional recording;  2.Built-in 7-Band equalizer;  3.2 Line (L/R) audio output;  4.1 to send output, 1 return input;  5.1 Line to high-fidelity headphone output power (1W);  6.Headphone Monitoring function, Bluetooth Function, Recording Function;    High-performance microphone pre-amplifier with phantom power(+48V).  Built-in mute switching mode power supply.  High-performance three colors output level meter.  24-400Hz adjustable dual channels sub output.  With MP3, USB input players.  Exquisite color crystal buttons channel switch.  SMT automated technique for strict control the consistency of the products.    Specification: Frequency Response:20Hz-20KHz, 0.5dB;  THD+N:-30dB input to mix, mic gain 30dB,96dB;  Crossover Fader Position:>96dB;  Aux Send Port:>86dB;  Output Level Meter:L/R mix output level is 12 segment of LED indicator;  Power:AC input 100 or 240V 50/60Hz;  Power Consumption:<30W;    Package includes: 1x 4 Channel Mixer;  1x Power Adapter;  1x Manual