Features: Stereo Auditory Mixer Distributor Signal Selector Switcher 2 Input 4 output 3.5MM Individually Controls Headphones Amplifier Two stereo Auditory inputs and four outputs can directly push four earphones or external amplifiers not affecting each other The power supply is DC5-15V, the magnification is 5 times (14dB), and the potentiometer controls the sound of each output respectively. The high current operational amplifier NJM3414A is used, and the maximum output current is 70mA, which can provide good dynamic output. Input and output with 3.5mm connection for easy use Specifications: Power supply: DC5-15V Maximum output current: 70mA Magnification: 5 times (14dB) Input: 2 channel Output: 4 channel Size：about 13x7.5x7.3CM/5.12x2.95x2.87in Package Includes: 1PC Headphone Amplifier 1PC Cable note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color.