Cubilux Am-K4 6.35Mm Audio Mixer, 4-Channel Line-In 1/4" Mini Aux, Hifi Amp]. [4-In 1-Out 6.35mm Mixer] ? Cubilux Quarter Inch Mini AUX Mixer offers 4-way of stereo/mono inputs that let you connect guitar, bass, keyboard, drum, or introduce music from Amplifier or other source devices for monitor, composition, instrument practice or performance, multitrack recording etc. [Support Stereo Mono Signal] ? Cubilux 6.35mm Mini Mixer allows you to mix Stereo (Both left and right channels) and Mono (Left channel ONLY) audio signal simultaneously. The maximum input signal level is 10Vrms. [Built-In HiFi Analog Amplifier] ? Cubilux 1/4-inch Mixer is integrated with an analog HiFi AMP to amplify audio stream for superior sound quality. With the AMP, the mixer is powerful enough to drive premium headphones up to 600 ohm. [USB C 5V Power Supply] ? The audio mixer features a USB Type C port for power supply, it?s convenient to power the device with smartphone charger. Please note that the mixer comes with a USB A to USB C charging cord and requires minimal 5V 1A power adapter (NOT included) for power supply. [NOT for Microphone Signal] ? Please note that this mixer is ONLY for audio line-in and does NOT support any kind of microphone input.