1. The mixer is equipped with, input gain and high and low pitch adjustment. The built-in 48V phantom power supply is suitable for direct power supply of condenser microphone, high-definition headset output port, MP3 player, Bluetooth receiver, and connected PC sound card.2. The mixer is small and light, and can be directly connected to the USB port of the PC for power supply. No additional power is required. It can be connected to the computer for power supply through USB, saving the of using an external adapter3. You can also use a mobile power supply or USB AC/DC adapter to power it.4. This mixer is a multi-purpose 4-channel mixer with sound card, which can the 's needs music production, online live , karaoke cover, etc5. Mini portable, easy to operateModel: A4Totai Harmonic Distortion:less than 0.1%Frequency Response:20Hz~20KHz/0.5dBS : -80dBMAX Outputs:4V/MAXInput/Output impedance:MIC:2.4Kohm:11KohmStereo:100KohmParametric EQ:HI:12KHz15dBLOW:80Hz/15dBProduct size: 180 150mmFunction:1,2 channel signal input channel stereo input2,One main channel output,one AUX output and feed back3, channel for recording output and monitor4,Low-noise,high-precision microphone preamplifier with perfect sound 5,Balanced XLR microphone input and balanced inputs,3-band channel EQ6,48V DC phantom power will responsible for connect with condenser mic,and power supply for input port7,Port for eqrphone monitor8,Precision logarithmic double 10 LED level display9,MP3 module,USB interface,and display10,Built-in switching power supply is flexible(AC100-240V AC),low power consumptionPlug Type: US Plug, it applies to Canada, , Mexico, Thailand, Taiwan, the , the Philippines and so on.Colour:blackMaterial:ABSPackage Contents:1 x 1 x USB power cord1 cord plug1 x English manualOnly the above package content, other 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.