How do I check the battery level on the G435?

Single press the Power button when the headset is on. If battery is 31-100%, the LED shows green for 5 seconds. If battery is 15-30%, the LED shows red for 5 seconds. If battery is below 15%, the LED flashes red for 5 seconds. (Page 8)

From the official Logitech G435 Wireless Gaming Headset manual, page 8

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