Features: Portable 4-channel mixing console with USB 2.0 terminal and sound card function, more convenient to use. DC 5V low voltage power supply, can be powered by computer or 5V power bank using the including USB cable. With USB 2.0 interface for connecting to a computer, and audio data can be sent between the mixer and computer. With one MIC/LINE (TRS XLR 2-in-1) mono input for connecting a microphone, an instrument or an audio device. With one 1/4 TRS guitar input jack that can be disabled for connecting an instrument such as electric guitar or bass. With 1/4 TRS LINE stereo inputs (L R) for connecting to line-level devices such as electric keyboard or audio device. MAIN output jacks (L R) for connecting powered monitor speakers; plus one 1/4 TRS stereo headphone jack. With 3.5mm headset microphone input jack 3.5mm headset headphone output jack. Other features: 3-band EQ volume fader for CH1; +48V phantom power for condenser microphone; built-in high-quality digital effect processor, etc.