Feature: 1. Free From Any Interference: The operational amplifier core and the volume control potentiometer cleverly amplify the signal of each channel without any interference. 2. 4 Channel Independent Knobs: Each channel of the headphone splitter is equipped with, and has 4 channels of independent volume control knobs, so that you can use the process more comfortable. 3. Not Difficult to Operate: The operation of this headphone amplifier is simple and easy to understand, the actual operation will not be difficult, each hole and knob has its own operating instructions. 4. Compact Size: Our headphone amplifier is compact, light weight, easy to carry, you can always carry around, will not take up a lot of space. 5. Exquisite Technology: This headphone amplifier is made of PC material, exquisite technology, safe and practical, no harm to users, you can go to use without worry. Specification: Item Type: Headphone Amplifier Model: P14 Material: PC Input: 1 x 3.5mm socket, 1 x RCA socket Output: 4x stereo 3.5mm socket Control: Master volume, master mute, input source selector, 4x channel volume Background Noise: -114dBu, 22k BW unweighted Maximum Channel Output: 400 mw per channel (200mw per side).5% THD at 32 ohm Dynamic Range: 122dB,22k BW Frequency Response: 17Hz-47kHz (-3dB) Power Supply: 12VDC adapter. Package List: 1 x Headphone Amplifier1 x Charger4 x Foot Pad1 x Manual Note: Please pay attention to the correct operation.