4-in-1 Output: Stereo mixer that combines four audio inputs into one stereo output. Each potentiometer independently controls the volume of its channel without affecting others. Easy to Control: The stereo audio mixer unit is constructed from premium metal, offering a robust and decent switching device. With bass and treble controls, you can adjust settings as needed. Long Range: This 4-in-1 mixer provides direct drive for headphones or connection to amplifiers, featuring a 3.5mm stereo jack. Includes a 3.5mm audio cable for extended input and output reach. Compatible Devices: The 3.5mm stereo mixer input interface is compatible with PCs, mobile phones, laptops, etc. The output is compatible with speakers, headphones, soundbars, and more. Stable: Operates on DC 5V-12V with a DC5.5 x 2.1 connector. Features a gain of approximately 2x. Idle current is around 8mA, utilizing an NJM3414 low-voltage, high-current op-amp. Maximum drive current is 70mA, easily powering headphones and external amplifiers.