The G1 and G3 buttons (G-keys) on the G935 gaming headset are pre-programmed to cycle through equalizer profiles and lighting effects.
You can use the G1 button to cycle through the lighting effects and G3 to cycle through equalizer profiles.
Cycling behavior is different depending on whether or not the headset is connected to a computer with Logitech G HUB installed.

Connection to a computer with G HUB
When the G935 gaming headset is connected to a computer with Logitech G HUB installed and running, the lighting effects and equalizer profiles that have been programmed into G HUB are used when you press the G1 or G3 buttons.
Connection to all other compatible devices
When the G935 gaming headset is connected to a PC that does not have G HUB installed or is connected to another compatible device, the equalizer profiles and lighting effects stored in the headset's onboard memory are used when you press the G1 or G3 buttons.
Important Notice: The Firmware Update Tool is no longer supported or maintained by Logitech. We highly recommend using Logi Options+ for your supported Logitech devices. We are here to assist you during this transition.
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