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 Amplifier Material: Iron Shell Type: 14Inch TS Connector, Stereo Impedance: 100k Ohm Headphone Output: Type: 14Inch TS Connector, Stereo Impedance: 80k Ohm . Package List: 1 x Headphone Amplifier 1 x Instruction Manual1 x Adapter