Feature: 1. SUPERIOR PERFORMANCE: Four independent stereo high power amplifiers for the highest sound quality with almost any type of headphone, suitable for stage and studio performances or applications requiring multiple headphone connections. 2. FOUR CHANNEL: Amplifier 4 channels with individual volume knobs for each output; no sound crackle, minimal distortion at highest volume levels. No signal loss when connecting all four headphones. 3. APPLICABLE: The stereo headphone amplifier 4 channel is perfect for up to four people to monitor the mix for tracking during workouts, live use and listening to TV with earbuds. 4. CONVENIENT TO USE: Easy to use and great for listening to music or watching TV if you have two or more sound setups on your computer or listening with a stereo amplifier. 5. HIGH QUALITY: The headphone amplifier is constructed of sturdy metal with tight connections and simple knob operation. The high quality components and exceptionally robust construction ensure a long service life. 6. EASY TO CONTROL: The 4 channel stereo headphone amplifier's 5 buttons ensure easy control; 1/4 in and 1/8 in outputs, 1/4in, 1/8 in TRS and RCA inputs meet usage requirements. Specification: Item Type: Headphone Amplifier Material: Metal Model: AMP-14II Colour: Black Scope of Application: Ultra Compact Headphone Amplifier System for Studio and Stage Applications Channels: 4 Channels Input Jacks: Stereo 3.5mm TRS Jack, Stereo AV Jack Input Impedance: 22KΩ Input Signal Level: +22dB Output Jacks: Stereo 1/4 in TRS Jack, Stereo 3.5mm TRS Jack Output Impedance: 16Ω Minimum Maximum Gain: 19dB/Channel SNR: >98dB. Package List: 1 x Headphone Amplifier 1 x Power Adapter 1 x Power Cord 1 x Manual