4 Channels, 8 Headphone Outputs & Volume Control: This headphone amplifier features 4 channels, each with a dedicated volume knob. It comes with 4x1/4 Inch and 4x1/8Inch stereo TRS output jacks, allowing up to 8 headphones to connect simultaneously. Versatile Inputs & Mixing Capability: Each input channel has a mute switch, enabling you to blend signals from different inputs. Use the mute switches to fine-tune signal input when using all channels together, unlocking mixing experiences for music production or audio sharing. HD400 4-Channel Headphone Amplifier Portable Headphone Signal Splitter Supports 8 Channels. 4 Channels, 8 Headphone Outputs & Volume Control: This headphone amplifier features 4 channels, each with a dedicated volume knob. It comes with 4x1/4inch and 4x1/8inch stereo TRS output jacks, allowing up to 8 headphones to connect simultaneously. Versatile Inputs & Mixing Capability: Each input channel has a mute switch, enabling you to blend signals from different inputs. Use the mute switches to fine-tune signal input when using all channels together, unlocking mixing experiences for music production or audio sharing. Color:Black Material:ABS Package Contents: 1 * 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.