Fangrui Product Details Elevates Your Music Experience With The Portable In Ear Monitoring Amplifiers, Featuring High Fidelitys Headphone Amplifiers With 3.5mm Input For Pristines Sound Quality. The Amplifiers Small Design And Convenient Belt Pack Clip Make It Companions For Musicians On The Go, Ensuring Professional Amplification. Tailored For Keyboardists, Drummers, And Guitarists, This Headphone Amplifiers Offer Personalizes Monitoring For Immersive Practice And Performances. For Live Shows And Studio Rehearsals, The Amplifiers Provides A Reliable And Consistent Sound Feed, Allowing Artists To On Their Craft Without Distractions. 3.5mm Headphone Output/input; Colour:black Material:metal Package Contents: 1 * Headphone Amplifier Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thing. The Measurement Allowed Error Is +/- 1-3cm.