ATEN US221A User Manual page 22

Manual Switch and Release
If the US221A / US421A is operating under manual control (with
a USB 2.0 peripheral such as a storage device, for example),
enable this button to set the time for a reminder to release control
of the US221A / US421A. The reminder will appear as a dialog
box on screen of the PC currently in control of the US221A /
US421A.
General
Enable this button to turn the US221A / US421A's configuration
utility beeper on.
Note: 1. This enables the software beeper. To enable/disable
the hardware beeper, use the On/Off switch located on
the side of the US221A / US421A unit.
2. Default settings are Enabled.
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