Sony Ericsson Xperia active ST17 User Manual page 127

Accessibility Enable your installed accessibility services and adjust related
settings.
Developer Set options for application development. For example, you can
options show CPU usage on the phone display and show visual feedback
for touches. You can also set the phone to enter debug mode when
USB is connected.
About phone View information about your phone, such as the model number,
firmware version, phone number, and signal. You can also update
your software to the latest version.
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