Samsung Gear S2 classic User Manual page 88

Applications
S Voice
Introduction
Perform various tasks simply by speaking.
Make sure the Gear's microphone is not obstructed when you are speaking into it.
Setting a wake-up command
You can launch S Voice using your own wake-up command. You can only use this feature when your Gear's screen is turned on.
When launching S Voice for the first time, tap
X
• To change the wake-up command, tap More options, rotate the bezel to Change wake-up command >
tap Start and follow the prompts.
OK > Start and set your own wake-up command.
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OK, and then