This article explains how to connect Sony headphones, earbuds, and speakers to Bluetooth devices such as smartphones, tablets, and laptops. Consult the manufacturer's manual for your specific device if the steps seem to differ.
Most modern Sony Earbuds, including the WF-SP700N, WF-1000X, and WF-1000XM3, are designed to enter pairing mode the first time you turn them on. Follow these steps to pair them with your device.
If this is your first time using the earbuds, remove them from the case to enter pairing mode.
If this is not your first time using them, or you want to pair them with a new device, take the earbuds out of the case, place them in both ears and press and hold the power button for 10 seconds.