How do I turn the G435 on and off?

To power on, press the Power button for 1.5 seconds when the headset is off. To power off, press the Power button for 3 seconds when the headset is on. The headset will also automatically shut off after 30 minutes of inactivity. (Page 6)

From the official Logitech G435 Wireless Gaming Headset manual, page 6

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