What is Sidetone on the G435 and how do I enable or disable it?
Sidetone lets you hear your own voice while communicating with other people, mirroring the experience of talking on a phone so you can adjust your speaking volume. To enable Sidetone, double press the Mute button — the LED will flash twice in orange. To disable it, double press the Mute button again — the LED will flash once in orange. (Page 9)
From the official Logitech G435 Lightspeed Wireless Game Headset manual, page 9
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