Feature 1Metal Material: This small headphone amplifier is made of excellent metal material, which is sturdy and can be used for a long time. 2Channels: There are 8 headphone output channels and 1 input channel, and the volume of each output channel can be independently controlled. 3Portable Design: This ultra compact stereo headphone amplifier is small in size and easy to carry around, can be used at anytime, anywhere. 4Great Performance: Even at maximum volume, this metal headphone amplifier can provide the highest sound quality for each earphone. 5Applications: This headphone amplifier is suitable for studio and stage applications. Enjoy an low noise monitor distribution and music system.SpecificationItem Type: Headphone AmplifierMaterial: MetalWeight: Approx. 539g/19.0ozVoltage: 100 to 240VRecommended Maximum Impedance of Headphones: 65 to 80OhmOutput Type: LINE OUT (O OUT)Input Type: LINE IN (O IN) .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 xHeadphone Amplifier1 x Adapter1 x Specification