Welcome to our store！</br> 1、Metal Material: Headphone amplifier is made of metal material, strong and durable, ultra compact design for easy carry. 2、4 Channel Stereo Headphone Amplifiers: It has 4 headphone output channels and 1 input channel with excellent sound quality. 3、Independent Control: The volume of each output channel can be controlled independently. Provides the highest sound quality for each earphone even at maximum volume. 4、Low Noise: The ultra low noise 4580 operational amplifier ensures superior sound quality. Enjoy a low noise monitor distribution and music system. 5、Widely Used: Ultra compact headphone amplifier system is for studio and stage applications, outdoor performance, mini concert, karaoke, conference speech. <p class="wang-edit-text"><p class="wang-edit-text">Item Type: Headphone Amplifier Material: Metal Weight: Approx. 315g / 11.1oz Voltage: AC 100-240V 50Hz 60Hz&nbsp; <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 Headphone Amplifier 1 x Adapter&nbsp; 1 x Instruction Manual 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>