How do I pair the G435 with a Bluetooth device?
Press and hold the Power button and Mute button together for 3 seconds or longer. The LED will flash blue as it enters pairing mode. Then connect to your preferred device. Note that G435 can only connect to a single Bluetooth device at a time. (Page 4)
From the official Logitech G435 Wireless Gaming Headset manual, page 4
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