Kygo A3/600 - Bluetooth Pairing; Enter in Pairing Mode

ENGLISH
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You need to pair the headphone with your Bluetooth® enabled device
(smartphone, tablet, mp3 player, computer, etc.) before enjoying the
music wirelessly with the earphone.
Enter in pairing mode
Be sure that the headphone is in power of status first, then press and
hold the MFB for about 5 seconds, until the RED and BLUE LEDs blink
alternately. Then release the MFB buton, the device is now in the pairing
mode.
Bluetooth Pairing