The **Fiio FT1 Pro** is an advanced open flat diaphragm earphone, designed with a custom 95x86mm self-developed flat panel unit. Featuring a 1um special film diaphragm, dual sapphire-aluminum coating, and a balanced open acoustic design, the FT1 Pro delivers a wide frequency response from 7Hz to 40kHz. With a lightweight and breathable build, it is engineered for comfort and exceptional sound quality.