1.The mixer adopts double-panel patch technology, which has lower noise and higher quality. Non-market general plug-in technology is comparable. 2.The true pressure limit function, the potentiometer fader, the self-locking button, these functions and the use of materials a for the sound quality, performance and stability of mixer. We have always insisted on high performance and high quality. 3.It can be directly connected to the device interface with USB, the LCD bubble wood clearly displays the song playback status, with a recording function, and can also be connected to a recorder to play audio 4.Built-in Bluetooth function, the mobile phone can open the Bluetooth search and link. Built-in two UHF professional wireless microphones 5.High-quality interface + LCD screen mp3 player + foot pad British potentiometer + high-quality input interface + 48V fantasy power supply + indicator light you deserve Maximum input level: microphone input + 22dbu / line input + 20bu; Maximum output level + 22dbu main channel level display: 2LED from signal to value; Input channel level: 1 led display Frequency response range: 20Hz to 22khz 1dB; CMRR (mc1khz): 75db harmonic loss: Less than 005% (channel input to output) Resolution (at 1kHz: channel mute): 80dB Noise , (ms22hzt22khz): equivalent - 122d U residual output noise Less than 8dbu mono / stereo input channel equalizer: , broom, + 15d8, 12khz bass, broom, + 1-15db, 80h maximum input power: dc5ca5watt Net weight: 1510g size:15x18x3.5CM Material:metal colour:Black Package Contents: 1 x Mixer 2 x microphone 1 x USB power cord Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.