Long press the function button for 2 seconds until the indicator inside the case flashes (make sure the headset is inside the charging case), search for \"FreeBuds 3\" via Bluetooth, and click Pair. PS: If the mobile phone system is EMUI10 or above, long press the function key until the indicator flashes, and when the headset is close to the phone, the automatic pop-up window will appear. Click \"Connect\" for pairing.