Logitech G Wired 7.1 LIGHTSYNC Mode D'emploi page 7

SETUP FOR PC (3.5MM MODE)
The G635 can also connect to audio
devices solely via 3.5mm cable.
1. Set mode switch to 3.5mm
2. Connect to PC using the 3.5mm cable
Features that require USB power,
including 7.1 surround sound, on-headset
buttons, volume wheel operation, and
customization of lighting and button
functions are not available without USB
connection.
Some PCs may require a 3.5mm 4-pole to
mic/stereo splitter adapter (not included)
to use microphone features in this mode.
All manuals and user guides at all-guides.com
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3.5mm