Ultra- stereo headphone amplifier for studio and stage application. With 4/6 headphone output channels and 1 input channel. Provides highest audio quality for each headphone even at maximum volume. 4/6 Channels: 4/6 high-power amplifier, each output channel with volume control for setting volume independently. Ultra low noise operational amplifier for outstanding audio performance. 4/6 channel stereo headphone amplifier can be used for up to 4/6 headphones at the same time for simultaneous of main mix with separate volume control. The ultra stereo headphone amplifier is easy to carry around and can be used anytime, anywhere. For stage and indoor performances or applications that require multiple headset connections. Stereo Control: MONO/STEREO control buttons is easy to control mono and stereo audio source. When your audio source is mono input, you can press the stereo button to the stereo effect. Colour:green Material:Metal+ABS Size:about 202 x 75 x 29mm Package Contents: 1 x Audio Mixer 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.