Ultra-compact stereo headphone amplifier for studio and stage applications.With 8 headphone output channels and 1 input channel.The volume of each output channel can be controlled independently.Provides the highest sound quality for each earphone even at maximum volume.Ultra-low noise 4580 operational amplifier with outstanding performance.Comes with a DC 12V adapter.Input type: LINE IN (O IN)Output type: LINE OUT (O OUT)-in battery: NoneRecommended headphone maximum impedance: 65-80 OhmType: Mini Amplifier: HA800Product weight: 350gPlug Type :EU Plug,it applies to Indonesia, Germany, , Spain, and so on.Voltage:DC12VColour:blackMaterial:MetalSize: 19.6 x 5.7 x 3.1cmPackage Contents:1 x Amplifier1 x AdapterOnly the above package content, other products are not included.Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.