Welcome to our store！</br> 1、Metal Material: The shell of this headphone amplifier is made of premium metal, strong and durable. With non slip pad at the bottom, great stability. 2、4 Channel Stereo Headphone Amplifier: 4 channel distribution system allows up to 4 person to listen and play at the same time, with excellent sound quality. 3、Independent Adjusting Knob: Individual volume controls enable each listener to determine their own volume level via a dedicated output volume control knob. 4、Five Buttons: The headphone amplifier has 5 buttons for easy control, 1/4 inch and 1/8 inch outputs, and 1/4 inch and 1/8 inch TRS and RCA inputs for use. 5、Low Noise: Enjoy a low noise monitor distribution and music system. The ultra compact stereo headphone amplifier is easy to carry and can be used anytime, anywhere. <p class="wang-edit-text">Item Type: Headphone Amplifier Material: Metal Weight: Approx. 553g/19.5oz Input Interface: stereo 3.5mm TRS interface, stereo AV interface Input Impedance: 22K ohm Input Signal Level: +22dB Output Interface: Stereo 1/4 inch TRS interface, stereo 3.5mm TRS interface Output Impedance: minimum 16 ohms Maximum Gain: 19dB/channel Signal to Noise Ratio: &gt; 98dB Power Supply: DC 5V, external power adapter Power Input: AC 100V to 240V, 50/60Hz <style> .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }</style> 1 x&nbsp;Headphone Amplifier1 x Adapter 1 x Specification 1 x Data Cable Satisfaction - Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactoryaftersalesservice</br>