The FiiO FD3 PRO are in-ear monitors designed for everyday listeners seeking customizable sound and clear audio. They feature a 12mm dynamic driver with a diamond-like carbon (DLC) diaphragm to minimize distortion and deliver a clean, punchy sound. The semi-open design promotes a natural audio experience and reduces ear pressure during extended use. These earphones offer customizable sound through two included interchangeable sound tubes: one for enhanced treble and another for boosted bass. The FD3 PRO comes with a premium eight-strand silver-plated copper cable featuring a Litz structure for improved conductivity and durability. Unlike some models, they include interchangeable plugs (3.5mm, 2.5mm, 4.4mm) for broad compatibility. The earphones are lightweight, finished with a glass faceplate, and are black in color. They are categorized under Electronics & Photo > Headphones, Earphones & Accessories > In-Ear Headphones.