The options screen allows you to change your display units between Metric and Imperial. You can also set audio chimes for distance and time intervals. Click on the following icon from the main screen of the app to switch to the options screen.
Changing the display units affects how information is displayed in other screens of the app.
The Chime Interval section allows you to specify an audible chime alert for time/distance or both. When the distance covered or time elapsed reaches the specifed interval a chimes is played on the device.