Fangrui Product Details 1. [plug And Play] Connected To The Device Interface Can Be Used, Without External Power Supply, Simple Operation 2. [separate Volume Control] With Output Volume Control, You Can Adjust The Ideal Volume According To Your Preferences 3. [xlr Stereo Input] The Xlr Input Connection Has A Locking Structure In Case Of Accidental Cable Disconnection. Just Press The Label Next To The Bottom Mounting Connector To Release The Cable At The End 4. [standard 3.5mm Headphone Output] Metal 3.5mm Headphone Output Interface Can Be Easily Connected To Conventional Earbuds Or Professional Headphones, Bringing You A Clear Music Experience 5. [small And Easy To Carry] You Can Put It In Your Pocket, Clip It In Your Jacket Pocket/backpack Strap Or Use A Lanyard To Easily Hang It On Your Chest Interface:3.5mm/xlr(xlr Connector Not Included In Package) Colour:black Material:iron Package Contents: 1 X Headphone Amplifier Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And Different Disp