1.1 Hi-Res Audio quality is supported by default, requiring playback of 96kHz/24bit high-resolution audio files (transmission rate up to 990kbps), enhanced bass performance with dynamic bass algorithm; 1.2 LDAC decoding is disabled by default at the factory and is only supported by Android phones: After connecting, open the Haylou Sound APP to enable LDAC. The changes will take effect after the headphones restart. Go to your phone's settings → Bluetooth → Headphone Name → Audio Encoding, select "LDAC", and it is recommended to set it to "Emphasis on Audio Quality (990kbps/909kbps)".