How do I pair the G435 to a device via Bluetooth?
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 pairing mode. Then connect to your preferred Bluetooth device. Note that the G435 can only connect to a single Bluetooth device at a time. (Page 4)
From the official Logitech G435 Lightspeed Wireless Game Headset manual, page 4
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