Btuty Ultra Low Noise 4 Channel Line Stereo Mixer 4 Input 1 Output Dc 5V ??Multi-Channel Mixing Function?: This 4-channel stereo mixer allows you to mix microphone, guitar, bass, keyboard, electronic drum, etc., and enjoy the reverb you created. ??Ultra-Low Noise Design?: The ultra-low noise design ensures no hum, hissing, and audible noise are added into the system, providing a transparent and fluent sound streaming. ??Individual Volume Adjustment?: Equipped with 5 volume knobs, it supports individual volume adjustment of 4 inputs and 1 output, allowing you to freely adjust the volume as needed. ??Multiple Power Supply Methods?: The mixer is equipped with a DC 5V USB interface and can be powered by an adapter, power bank, laptop, etc. It is suitable for use in DJ, club, bar, party, studio, stage, and more. ??High-Quality Material?: The mixer is made of high-quality metal, sturdy and durable. With anti-slip mats at the bottom, it is stable to use. Its mini size makes it portable and lightweight.