Kygo A4/300 - Features, Operation, and Connectivity; Key Features

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Hands-free function
You can answer calls from your mobile phone when the headphone is
paired with your mobile phone. If you receive a call when listening to
music, your music will pause automatically and you will hear your phone
ringtone in the headphone.
Answer a call: Short press the multifunction buton.
Reject a call: Press and hold the MFB buton for 2 seconds until a beep
tone is heard.
End a call: Short press the multifunction buton.
Volume up in conversation mode: press volume “+” key. When the volume
has reached the maximum level, you will hear a beep tone.
Volume down in conversation mode: press volume “-” key. When the
volume has reached the minimum level, you will hear a beep n tone.
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