Feature:1. METAL MATERIAL: This small headphone amplifier is made of premium metal material that is rugged and durable for long lasting use.2. LOW NOISE: The low noise 4580 op amp ensures excellent sound performance and the high power stereo amplifier ensures maximum sound quality at maximum volume.3. 8 CHANNEL: Headphone amplifier features 8 independent channels, each switchable, with adjustable volume for each channel.4. INDEPENDENT CONTROL: 8 monitoring devices can be used at the same time, each device has an output volume control, easy to adjust the ideal monitoring volume.5. COMPACT AND PORTABLE: This stereo headphone amplifier is designed to be very compact and portable for use anytime and anywhere.Specification:Item Type: Headphone AmplifierMaterial: MetalType: 1/8in TS Connector, StereoImpedance: 100kOutput:Type: 1/8in TS Connector, StereoImpedance: Approx. 80kMaximum Output Level: Approx. 40mW in 100.Package List:1 xHeadphone Amplifier1 x Power Adapter 1 x Instruction Manual