HA800 Headphone Amplifier Audio Amp. Ultra-compact 8 Channels Mini Audio Stereo Microphone AMP. with Power Adapter 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: 100kΩ   Max. Input Level: +15dBu Headphone Output:   Type: 1/8" TS connector, stereo   Impedance: Approx. 80Ω   Max. Output Level: Approx. 49mW in 100Ω 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)