Description: brand new and high quality Features: Ultra-compact stereo headphone amplifier for stu-dio and stage application. With 4 headphone output channels and 1 input channel. Volume of each output channel can be controlled independently. Provides highest au-dio quality for each headphone even at maximum volume. Ultra low noise operational amplifier for outstanding au-dio performance. Compact 4-channel stereo headphone amplifier can be used for up to four headphones at the same for time for simultaneous listening of main mix with separate volume control. Comes with a for DC 12V power adapter. Specifications: Item Type: Headphone Amplifier Model: HA400 Power Supply: 110-240V Material: ABS+Metal Size: 103x46.5x57.2mm/4.05x1.83x2.25in Color: Black Plug Type: US Plug, UK Plug, EU Plug, AU Plug(Optional) Input Channels: 1 Input Output Channels: 4 Output Analog Inputs: 1 x Stereo Analog Outputs: 4 x TRS Controls per Channel: Volume Form Factor: Desktop Quantity: 1 Pc Note: Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1 x Headphone Amplifier 1 x Power Adapter