Features: Headphone amplifier: Design with 8 headphone output channel and 1input channel, you can share your music or radio Stereo amplifiers: This headphone amplifier comes with eight high-power stereo amplifiers that deliver the highest sound quality even at most volumes, creating studio-quality music experience. 8Independent output level control: The headsets amplifier have high-fidelitys analogs circuit and highly power output to ensure the consistency of input and output low noise 4580 operational amplifier: The headphone amplifier use 4580 operational amplifier. This feature ensures excellent performances and amplification with minimal noise interferences. Power supply: Universal 3.5mm input, more convenient to use Specifications: Component:Metal Size:Approx.12x4.9x2.4cm/4.72x1.92x0.94inch 3.5mm Input and Output Option Color:Black,White; DC12V Power Supply; Package Includes: 1pc Headphone Amplifier 1pc Power Cord 1pc 3.5mm Cable note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.