100% brand new and high quality Features: Ultra-compact stereo headphone amplifier for studio and stage application. Volume of each output channel can be controlled independently. Comes with a DC 12V power adapter. Compact 4-channel stereo headphone amplifier can be used for up to four headphones at the same time thomann i.e. for simultaneous listening of main mix with separate volume control. Comes with four powerful stereo amplifiers that deliver outstanding performance at any volume. Clear sound with ultra low-noise 4580 operational amplifiers that are used in 19" studio equipment. Specifications: Material:Metal Color:Black Size:Approx.103 x 46.5 x 57.2 mm/4.06x1.83x2.25in Output impedance: 80 Ohm Input impedance:100 Ohm 4 outputs with 6.3 mm stereo jacks 12 Volt Power Supply Included Option Type:Headphone Amplifier with European Plug;Headphone Amplifier with USA Plug Note: Please allow 1-2cm errors due to manual measurement,pls make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Includes: 1 x Headphone Amplifier