Features: This mixer is a multi-purpose 4-channel mixer with sound card, which can meet the needs of users' home music production, webcast, singing song cover and so on. The mixer is equipped with input gain and high and low sound adjustment. The built-in 48V power is suitable for direct power supply from condenser microphones, high-definition headset output port, MP3 players, Bluetooth reception, and a connected PC sound card. The mixer is compact and lightweight, and can be directly connected to the PC's USB port for power supply. It can be operated by USB connection to the computer without the need for additional power. This eliminates the hassle of using an external adapter. You can also use a mobile power supply or a USB AC/DC adapter to power it. 2-channel signal input and 1 stereo signal input. 1 set of main channel output, 1 set of auxiliary channel output and return interface. 1 independent recording output and listening port. Low noise, high accuracy microphone preamplifier with perfect sound quality. Balanced microphone XLR input and balanced line TRS input, 3-band channel equalization. Headphone monitor interface. Accurate logarithmic dual 10-bit LED level display. MP3 player module (USB interface, with display function). Specification: Total Harmonic Distortion:≤0.1% Frequency Response:20Hz~20KHz/±0.5dB S/N Ratio:≥-80dB Maximum Outputs:4V/Maximum Input/Output impedance: MIC:2.4KΩ Mono:11KΩ Stereo:100KΩ Parametric EQ: HI:12KHz±15dB LOW:80Hz/±15dB Package List: 1 x Mixer 2 x Users Manual 1 x USB Cord Note: Please kindly make a note if you need any plug adapter.