Stereo/Mono Simple Switching: Moukey mixer audio is divided into two channels. Stereo version-male connectors of 1 / 4-inch TRS stereo audio cable must be used for input and output connections (1 / 4-inch male-to-male stereo audio cable, TRS cable is Keypoint) then press the toggle key. Mono version-Mix 4 mono signal inputs into 1 mono signal output (1 / 4-inch TS male-to-male connector for input and output connection). NOTE: TRS / TS cables are not include in the packaging | DC 5V Power Supply: The digital mixer uses the latest DC 5V power supply mode, so it no longer restricts the application scenarios. NOTE: Please use an external power supply with CE or UL certification, and stay away from the interference source, otherwise it will cause noise and other undesirable interference to the product | Multi-function: It mixes multiple channels into one track, suitable for your keyboards, small stage setups, drum sets, or sub-mixes | Low-noise: Mini audio mixer produces the highest sound quality at all output levels, has ultra-low noise operability, and provides excellent audio performance. Distortion-free and easy to set up, nice for quickly mixing 4 line-level signals without complexity. The 4-channel mixer produces the highest signal quality with the highest signal integrity, even at the highest levels. It is good for multi-keyboard devices and recording | Simple Control: The audio mixer collects sound from many different sources (guitar, bass, and keyboard) into a monitoring position for monitoring or routing. Each channel on the linear mixer has an independent volume control, independent input plugs and volume control for each channel, and a single output from an amplifier