Welcome to our store! 1、Metal Material: The shell of this headphone amplifier is made of premium metal, strong and durable. With a non-slip pad on the bottom for excellent stability. 2、4-Channel Stereo Headphone Amplifier: The 4-channel distribution system allows up to 4 people to listen and play at the same time, with excellent sound quality. 3、Independent Adjustment Knob: Individual volume controls allow each listener to determine their own volume level via a dedicated output volume control knob. 4、Five Knobs: The headphone amplifier has 5 knobs 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 Level: Enjoy a low-noise monitoring distribution and music system. The ultra-compact stereo headphone amplifier is easy to carry and can be used anytime, anywhere. 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: at least 16 ohm Maximum Gain: 19dB/channel Signal-to-Noise Ratio: > 98dB Power Supply: DC 5V, external power adapter Power Input: AC 100V to 240V, 50/60Hz 1 x Headphone Amplifier 1 x Adapter 1 x Specification 1 x Data Cable Customers are our top priority. If you find any problems with your product after you have received it, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with the best customer service.