Ultra-compact stereo headphone amplifier suitable for studio and stage applications. Featuring 8 headphone output channels along with 1 input channel. Each output channel has independent volume control. Delivers exceptional sound quality for every earphone, even at maximum volume. Utilizes ultra-low noise 4580 operational amplifier for remarkable performance. Includes a DC 12V power adapter. Input type: IN (O IN) Output type: OUT (O OUT) Built-in battery: None Recommended headphone maximum impedance: 65-80 Ohm Type: Mini Amplifier Model: HA800 Product weight: 350g Plug Type: US Plug, suitable for Canada, Mexico, Thailand, Taiwan, the Philippines, and more. Voltage: DC12V Colour: black Material: Metal Size: 19.6 x 5.7 x 3.1cm Package Contents: 1 x Amplifier 1 Adapter Only the above package content, other items are not included. Note: Light reflection and different displays may cause the item's color to vary slightly from the actual product. Measurement allowed error is +/- 1-3cm.