Features: Ultra-compact stereo headphone amplifier for studio and stage application. With 8 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. Specifications: Plug: EU / US / UK (Optional) Line Input: Type: 1/8" TS connector, stereo Impedance: 100k Max. Input Level: +15dBu Headphone Output: Type: 1/8" TS connector, stereo Impedance: Approx. 80 Max. Output Level: Approx. 49mW in 100 Material: Metal Item Size: 196 * 57 * 31mm / 7.72 * 2.24 * 1.22in Item Weight: 332g / 11.72oz Package Weight: 509g / 17.97oz Package Size: 23.5 * 16.3 * 6cm / 9.25 * 6.42 * 2.36in Package List: 1 * Amplifier 1 * Power Adapter 1 * User Manual (English)