Feature: 1. [DSP Effect Capability] The professional 4 channel mixer has built in 16 DSP delay sound effect processor to improve your sound and music performance to enjoy it. 2. [Recording to PC USB Disk] The mixer has a built in sound card and interface, and the DJ controller can be recorded to a PC, U disk or mobile phone. It has built in recording control with output through USB port. 3. [Bluetooth Wireless Connection] This mixer enables users to wirelessly stream music from pad, phone and computer to mix music. It has built in control like play, pause, switch songs and modes. 4. [USB MP3 Flash Reader Compatibility] Can be connected by external USB, PC or Laptop, flash drive or Bluetooth devices to mix & record the sound output from the mixer to other devices. 5. [Stereo Input] 2 mono input, supporting XLR and unbalanced 1/4in plug with 48V phantom power, 1 stereo and USB or wireless input with 6.3mm XLR, RCA sockets for connecting different devices, like dynamic, condenser microphone, wireless mic receiver, guitar and other instruments, etc. Specification: Item Type: 4 Channel Mixer Material: ABS Model: BMG-04D Total Channel Output: 2 Mono Stereo Input Channel: 2/2 Microphone Input: 2 Mono Sound Adjustment: 2 high and low sounds Control Method: Knob Bluetooth USB Input Module: Yes Bluetooth: 5.0 One Key Anti Howling: Yes 48V Phantom Power: Yes Recording: Yes USB Sound Card Interface: 1 in 1 out Effect Module: 16 digital effects LED Level Indicator: Yes Voltage Range: 100-240V, 50-60 Hz . Package List: 1 x 4 Channel Mixer1 x USB Cable 1 x Plug1 x Manual Note: Since the two 48V phantom power supplies have relatively high requirements for voltage, if it is found that MP3 cannot be displayed normally, it means that the current voltage is insufficient. Please replace the power adapter, or directly connect to the computer for power supply.