For iPhone users and some Android users, FiiO's Air Link is a solution to improve Bluetooth headphone sound quality.
The Air Link is a 5g T-bar USB-C Bluetooth transmitter that plugs into your smartphone, upgrading its wireless audio capabilities.
Most smartphones lack support for aptX Lossless, with iPhones limited to AAC and most Android phones topping out at aptX or aptX HD, although all Android phones support LDAC natively.
The Air Link handles Bluetooth transmission with better codec support than most phones, making it a necessary tool for those with aptX Lossless-capable headphones or speakers.
most smartphones don’t support aptX Lossless
Author’s summary: FiiO’s Air Link upgrades Bluetooth audio.