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 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. 1 x Headphone Amplifier 1 x Charger 4 x Foot Pad 1 x Manual