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