Fangrui Product Details 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 :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