How do I turn the G435 headset on and off?
To power on, press and hold the Power button for 1.5 seconds while the headset is off. To power off, press and hold the Power button for 3 seconds while the headset is on. The headset will also automatically shut off after 30 minutes of inactivity.
From the official Logitech G435 Lightspeed Wireless Gaming Headset manual, page 6
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