Android mode:Freely use 3rd party apps, enjoy major music streaming apps;
pure tone mode:Exclusive FIIO Pure Music mode, for truly immersive music;
USB DAC mode:Connect to a computer/smartphone, to greatly improve their sound;
Bluetooth receiver mode:Supports aptX adaptive/LDAC and other codecs, for convenient high-quality sound;
AirPlay mode:Wirelessly connect to iPhone/iPad and other iOS devices, for improved sound quality;
Roon Ready mode:Roon Ready certified, a must for serious music players;
Coaxial/optical input modes:By being able to accept coaxial/optical inputs, the R9 transforms into a high-end audio decoder;
HDMI input mode:Supports audio input from devices like game consoles/Blu-ray players/set-top boxes;
HDMI ARC Mode:Supports audio return from devices like TVs/projectors;