Provide high quality +48V phantom power 3. Each channel has high, medium and low balance adjustments to optimize music performance and adjust indoor vocal parameters. 4. Each channel has an auxiliary sender for monitoring/effect/switching pre/post fader 5. Built-in 99 kinds of digital effects, including reverb, chorus, delay, pitch shift, multiple effects, and beat functions. 6. Built-in high-quality digital display MP3 player (U-DISK MP3 input). 7. All channels have peak signal indication and pre-fader monitor selection. 8. Independent headphone monitoring and level display system.