The mixer haa multi-purpose 4-channel power mixer with a sound card that can be used for home music production, webcasting, k song production, and other applications. Features The mixer features input gain and high bass adjustment, a built-in 48v phantom power supply for condenser microphone direct power supply, a high-definition headset output port, mp3 broadcast, and the ability to connect a computer with a sound card directly to a pc. the mixer is small and thin, and it can be powered directly from a computer's usb port. it requires no extra power and can be connected to a computer via usb. if you don't have access to an external converter, you can use handheld power or usb ac/dc. the transformer is the source of control for the adapter. 2 channel signal input and one channel stereo input one main channel output, one aux output and feedback. independent channel for recording output and monitor. low-noise, a high-precision microphone preamplifier with perfect sound quality