HA400PRO headphone amplifier is used to increase the output power of some music equipment. For music enthusiasts, headphone amplifier is a very useful device. It not only plays the role of amplifying power, but also can be used for tuning, which can make the music details and control tension of mid-to-high-end headphones more outstanding analysis, unimpeded listening, one-input and four-output stereo headphone amplifier Each signal is finely amplified, and the sound quality and tone are modified on the basis of increasing the output power to provide audio enjoyment control, no interference Each channel has an volume control knob to finely amplify each signal without interfering with each other Small size, easy to carry Name: Headphone Amplifier Model: HA400 PRO Channel: 4 channels Plug Type :EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so o Colour:As Shown Material:Aluminum Alloy Voltage: AC110-240V Package Contents: 1*Headphone Amplifier 1*Power Adapter 1*English manual 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.