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6 Knowles BA drivers with the carefully designed 4-way crossover & low-frequency ultra-long sound tube completely covers the entire audible frequency range with a sound that will take your breath away
The FA9 marks the first time FiiO has employed Knowles EJ balanced armature drivers, commonly used among high-end IEMs.
FA9 employs a specially-designed ultra-long sound tube 80.6mm in length which acts as a low-pass filter that filters out unneeded extra mids & highs to ensure a seamless frequency response.

Ergonomic Sports Design and IP7 Waterproof: The running headphones are ergonomically designed and come with 3 different sizes of soft ear tips (S/M/L), which fit most ear canal contours. The earplugs will be very comfortable and not easy to fall off when worn. They’ll also stay in place, whether through intense exercise or prolonged use. At the same time, wireless headphones has an IP7 waterproof rating, which can resist sweat, rain and minor water splashes, which is suitable for exercise, and running.
3D Stereo Sound and Crystal Clear Calls: The wireless earbuds sport adopt SBC/AAC audio decoder and equipped with 13mm diaphragm speaker driver, which can provide a powerful and wide sound range, bringing crisp sound and deep bass. The noise cancelling earbuds are equipped with CVC8.0 noise reduction technology, which can monitor and suppress the noise in the surrounding environment in real time, allowing you to immerse yourself in a pure and clear music world and enjoy uninterrupted listening.
Bluetooth 5.3 and Seamless Pairing: Csasan bluetooth earbuds feature an advanced Bluetooth 5.3 chip for lightning-fast transmission, rock-solid connectivity, and an expansive range. Enjoy an unparalleled, silky-smooth music and call experience, free from signal interruptions or audio degradation. After initial pairing, open the charging case to automatically connect the wireless earphones to your phone via Hall technology, simplifying the process and saving valuable time.