Features: With 8 headphone output Channel and 1Input Channel and Independent Volume Control for Each Channel Great sound quality even at top output level. Excellent performances, with low noise operational amplifier. Portable 8-channel mixer The noise canceling microphone effectively reduces the volume, allowing you to enjoy high-quality music. Specifications: Material:Metal 8-channel Input:1 or 8in TS, Up to and15dBu Input Impedance:100k Output:1 or 8in TS, 40mw Up to in100 Output Impedance:80k Option Type:US Plug Amplifier,EU Plug Amplifier, Note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1xHeadphone Amplifier 1xPower Cord 1xManual