+48V Phantom Power PAD button signal -20dB use for Electric Guitar, Bass etc DC 5V Power Supply, Please use a 5V 2A power plug Rugged Metal Chassis & TPR plastic edging Instantly Receives Wireless Music Streaming Audio Bluetooth 5.0 Wireless Range: 50' Feet Professional DJ 4 Channel Sound Mixer This DJ controller 4 channel audio mixer with Dual Mic machine by DGNOG is the perfect way to mix audio from MP3, mic, and bluetooth connected devices. 1-2 channel has gain control, Treble/Mid/Bass/Control, FX Reverb control & independent volume control. 3-4 Channel are RCA stereo inputs, this channel only has volume control, For input and connection computer music, vcd, dvd, cd player, TV audio signal. USB 2.0 Audio Interface, for Computer Playing & Recording Built-in FX Reverb Effect, 1 & 2 Channel FX Reverb Independent knob & 3-band EQ Combo Jacks (XLR+6.35mm) for MIC/LINE Inputs 3.5mm AUX Input Jack for Phone Playing Music RCA Jacks for Stereo Input and Output, 2-TK RCA Input Jacks, 6.35mm Main Output Jacks 3.5mm Jacks for Microphone Input & Earphone Monitor Output Read more Bluetooth 5.0 Function Bluetooth-enabled devices like tablet, smartphone, iPad, simple hassle-free pairing. Wirelessly stream music like from your device directly to your mix USB 2.0 Compatibility Can connect to a USB stick to play & record audio. Can connect to PC, Smartphone with compatible adapter, Cannot use bluetooth at the same time Three Band Equalizer R4-PRO 4 channel Audio mixer with 3 band equalizer, which allows tone control and precise high quality sound over High/Mid/Low +48V Phantom Power For the reliable power source, the stage/studio sound mixing console features a +48V phantom power supply. has ultra-low noise design Read more Built-in UHF Receiver DGNOG R4-RRO Sound board mixer built-in dual UHF frequency adjustable wireless mic, CHA 576.1-590.1Mhz, CHB 560.1-574.1Mhz, each channel has 15 frequency Reverb Knobs 2 Independent reverb knobs, You can control the reverb according to different occasions, this incredibly versatile mixer will make your vocals even better. 6 Inputs R4-PRO DJ mixer is equipped 2 combo jack XLR+6.35mm for mic/line/guitar inputs, 2-TK, Stereo RCA in, AUX, and 3.5mm mic input. is perfect for DJ party/music recording/creative remix Product Dimension The DGNOG Professional Audio Mixer has Dimensions (L x W x H): 5.71" x 8.07’’ x 1.96’’ with 2.86 lbs of package weight, So you can easily carry everywhere you go Read more Question Answer Q：Why the mixer cannot read the USB stick / USB stick not working？ A：Please check if the music in the USB stick is in MP3 format A：Please check if the USB stick has the numerous software program/folder A：Please check whether the power supply is normal. Occasionally, the power supply of the USB interface of the computer is insufficient, which will cause the mixer to be unable to read the U disk & the wireless microphone that comes with the mixer cannot be used. You can try to use a 5V 2A power plug to supply power. Recommend: USB stick only stores music in MP3 format