Description:Using 4-channel design, this amplifier can be used for up to four headphones at the same time for simultaneous listening of main mix with separate volume control.Characterized by ultra low noise operation and outstanding audio performance, this amplifier provides the highest audio quality for each headphone even at maximum volume.It is made of high-quality metal material, which is reliable and durable.The length of the product is 10.5cm, the width is 5.5cm and the height is 4.5cm.It is an ultra-compact stereo headphone amplifier for studio and stage application with 4 headphone output channels and 1 input channel. Volume of each output channel can be controlled independently. And it is equipped with DC 12V power adapter.Item Name: Headphone AmplifierMaterial: MetalModel: MA400Plug Type: AU Plug, UK Plug, EU Plug, US Plug (Optional)Features: 4 Channels, Stereo, Ultra Low NoiseSize Details: 10.5cm x 5.5cm x 4.5cm/4.13" x 2.17" x 1.77" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Headphone Amplifier 1 x Power Adapter1 x User Manual