High-quality balanced line architecture headphone amplifier, fully balanced line architecture, low ripple power supply, Japanese audio capacitors, wide frequency response. Distortion rate as low as 0.001%, signal-to-noise ratio of 110dB. Supports connection to multiple devices: computers, laptops, mobile phones, tablets, CD players, DVD players, TV boxes, digital players, smart . Fully balanced transmission can effectively suppress and offset external interference caused by various temperatures, electromagnetic waves, power supplies, etc. during the transmission process, making the sound quality purer and more transparent. Signal-to-noise ratio: 110dB Input port: XLR balanced, Line In Output port: XLR balanced headphone, 4.4mm balanced headphone, 6.35mm headphone Distortion: Less than 0.001% The printing/appearance from batch to batch, but it not affect the use; the actual product may have color difference due to different light or display. Note: 1. 4.4mm and XLR headphone ports are directly connected internally, and it is forbidden to insert 2 headphones at the same time. 2. The audio source device must have at least one of the analog single-ended or balanced signal output ports to connect to the headphone amplifier. Voltage: AC220V Colour:Black Material:Aluminum Alloy Specification:Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Package Contents: 1 x Headphone Amplifier 1 x US standard power supply 1 x EU standard adapter 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.