Feature:1. Universal to Use: The 4 channel stereo headphone amplifier is designed to work with all types of headphones, thus providing maximum flexibility.2. Outstanding Sound Performance: The 4 channel headphone amplifier's ultra low noise 4580 operational amplifier ensures excellent sound performance.3. Independent Output Levels: The headphone amplifier's 4 channels are set at independent output levels to meet a wide range of listening needs.4. High Power Stereo: 4 high power stereo amplifiers ensure maximum sound quality even at maximum volume.5. Independent Volume Control, Application: The volume of each output channel can be controlled independently. Suitable for studio and stage applications.Specification:Item Type: Headphone AmplifierMaterial: Iron ShellType: 1/4Inch TS Connector, StereoImpedance: 100kHeadphone Output:Type: 1/4Inch TS Connector, StereoImpedance: 80k.Package List:1 x Headphone Amplifier 1 x Instruction Manual1 x Adapter