Feature: 1. Easy Stereo Mono Switching: The sound mixer features two channels. The input and output connections must use the stereo version of the 1/4 inch sound cable with male connectors (1/4 inch male to male stereo sound cable; the cable is key). Simply press the switch to toggle modes. In mono mode, you can mix four mono input signals into a single mono output (use a 1/4 inch TS male to male connector for input and output connections).(TS cables are not included in the packaging.) 2. Flexible Sound Routing: This mixer allows you to blend four mono inputs into a single mono output seamlessly, making it suitable for various sound mixing scenarios without intricate setups. 3. Modern DC 5V Power Supply: Utilize DC 5V power technology for enhanced application flexibility, ensuring dependable performance without limitations, just remember to use certified external power sources 4. Quiet Performance: Experience excellent sound quality with exceptionally low noise levels across all output stages, guaranteeing excellent sound quality even at maximum volume settings. 5. Suitable for Recording and Mixing: This 4 channel mixer is suitable for quick sign blending and recording multiple keyboard devices, ensuring high sign integrity and fidelity in every mix you create. Specification: Item Type: 4 Channel Stereo Sound Mixer Input Output Type: 6.35mm Stereo Interface Power Type: Type C DC 5V Material: Metal Size: Approx. 108x76x32mm / 4.25x2.99x1.26in . Package List: 1 x Mixer 1 x Manual 1 x Cord