2 input 4 output stereo mixer distributor with 3.5 mm connectors and individually controlled headphone amplifier Function and operation 2 stereo inputs and 4 stereo outputs providing flexible routing for listening and monitoring. Each of the four outputs has its own volume control via a potentiometer, allowing independent listening levels. Gain and power Gain is 5 times (14 dB), delivering clear amplification for connected headphones or small external amplifiers. Power supply range: DC 5V to 15V. Connections and compatibility Input and output use standard 3.5 mm connections for easy integration with most audio devices. Two stereo inputs can be used to feed either separate sources or mixed signals to the four outputs. Four outputs can drive four headphones or connect directly to external amplifiers without mutual interference. Design and performance Compact, straightforward design tailored for quick setup and reliable operation. Independent channel control helps prevent crosstalk and ensures consistent monitoring across multiple listeners. Use scenarios Educational settings: a classroom or workshop where multiple students need to hear the same material at adjustable volumes. Small studio or rehearsal space: share monitoring from two sources with four listeners, each at their preferred level, without affecting others. Audio testing and development: route two test signals to multiple headphones or external amps to compare listening results in real time. Practical notes 3.5 mm input/output compatibility makes it easy to integrate with most consumer audio devices. The unit focuses on providing individual level control and reliable multioutput capability without introducing crossinterference between outputs.