How do I pair the G435 to a device via Bluetooth?
Press and hold the Power button and the Mute button simultaneously for 3 seconds or longer. The LED will flash blue to indicate the headset has entered pairing mode, then connect to your preferred device. Note that the G435 can only connect to a single Bluetooth device at a time.
From the official Logitech G435 Lightspeed Wireless Gaming Headset manual, page 4
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