Features 1.WIDE APPLICATION: Ultra compact 8 channel stereo headphone amplifier for studio and stage applications. 2.INPUT AND OUTPUT, ONE BUTTON SWITCHING: The headphone amplifier has 8 headphone output channels and 1 input channel. Supports mono and stereo switching at the touch of a button. 3.PROFESSIONAL DESIGN: The 8 channel stereo headphone amplifier is designed to work with all types of headphones, thus providing maximum flexibility. 4.SUPERIOR SOUND QUALITY: 8 high powered stereo amplifiers guarantee the highest sound quality even at maximum sound levels. 5.INDIVIDUALLY CONTROLLED, LOW NOISE AMPLIFIERS: Each output channel can be independently controlled in terms of volume. Ultra low noise 4580 operational amplifiers for superior performance. specificationItem Type: Headphone Amplifier_x000D_ Material: Iron Shell_x000D_ Line Input_x000D_ Type: 1/8 Inch TS Connector, Stereo_x000D_ Impedance 100k_x000D_ Maximum Input Level: +15dBu_x000D_ Headphone Output_x000D_ Type: 1/8 Inch TS Connector, Stereo_x000D_ Impedance: 80_x000D_ Maximum Input Level: 40mW in 100_x000D_ Voltage: 100-240V PackageList 1 x Monitor Headphone Amplifier 1 x Instruction Manual 1 x Adapter