How do I pair the G435 with a Bluetooth device?
Press and hold both the Power button and the Mute button for 3 seconds or longer. The LED will flash blue to indicate the headset has entered Bluetooth pairing mode, at which point you can 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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