Feature: Ultra- stereo headphone amplifier for studio and stage application. With 4 headphone output channels and 1 input channel. Volume of each output channel can be controlled independently. Provides highest audio quality for each headphone even at maximum volume. Ultra low noise 4580 operational amplifier for outstanding audio performance.Comes with a DC 12V power adapter. Specification Plug Type:EU Plug,it applies to Indonesia, , , , and so on Voltage: AC100-240V Material: Metal colour: Black Package Contents: 1 x Headphone Amplifier Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.