Keyboard Maestro Wiki

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The USB Device condition looks for a USB Device with a name that:

• exactly matches a specified string.
• contains (case insensitively) a specified string.
• matches a specified regular expression.

and then checks whether it:

• exists.
• does not exist.

Since USB Device names may be quite arbitrary, and may not match your expectations for the name of the device, if your text insertion point is in the text field of this condition and you connect (or turn on) the device, Keyboard Maestro will fill the matching name in for you.