Ultra Stereo Headphone Amplifier for Studio and Stage Applications With 4/6 headphone output channels and 1 input channel. Delivers highest audio quality for each headphone even at maximum volume. 4/6 Channels: 4/6 high-performance amplifiers, each output channel with volume control for independent adjustment. Ultra Low Noise Amplifier for Exceptional Audio Performance: 4/6-channel stereo headphone amplifier can be used for up to 4/6 headphones simultaneously, enabling main mix with separate volume control. Ultra Stereo Headphone Amplifier is portable and can be used anytime and anywhere. Ideal for stage performances or applications requiring multiple headset connections. Stereo Control: MONO/STEREO control buttons are easy to operate for mono and stereo audio sources. When your audio source is a mono input, press the stereo button for stereo effect. Color: Green Material: Metal + ABS Size: Approximately 202 x 75 x 29mm Package Content: 1 x Audio Mixer Only the above package content included; other products are not included. Note: Light reflection and different screens may cause the color of the object in the image to appear slightly different from the actual. Allowed measurement error is +/- 1-3cm.