3X(HiFi Headphone Amplifier 16-150 Ohm, Adjustable Audio with 3.5mm Jack4104
(1 x Headphone Amplifier kit). Portable Design: Its and portable design makes it easy to carry, ensuring you can enjoy high-quality audio wherever you go. Input/Output Port: 3.5mm Audio Port. Lithium-Battery capacity: 1000mAh.