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 High-quality 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 high-quality 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: US Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, the , the Philippines and so on. 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.