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"F3" and "F4" keys together serves as "Page Down". "F1" and "F4" together opens
the task list. Pressing the "F2" and "F3" keys together cycles through the running
programs; similar to pressing "alt-tab" on your PC. The Task List and task
switching are explained in greater detail in section 2.9.
The keys to the left and right of the spacebar are referred to as Control and Alt.
This is because, in native Android applications, these keys function as Control
and Alt on a QWERTY keyboard so that you may take advantage of native
Android keyboard shortcuts when they are present. In BrailleSense specific
applications, these keys operate similarly to "Space-1" and "Space-4" and provide
an alternative method for scrolling through menus and lists.
2.4 The Power Adapter and the Battery Pack
To check the battery power status, press "Space-1-6." The unit displays the
following 2 items:
1. Battery power level: expressed as a percentage of the remaining battery power
compared to a full charge.
2. Power source (battery or USB power)
If the battery power level drops under 15 percent, the Polaris MINI displays the
battery status on the Braille display, and it announces that the battery has less
than 15 percent of its power remaining. If the battery power level falls below five
percent, the Polaris MINI gives you a warning indicating that your battery power
level is under five percent, and the Polaris MINI will be automatically put to sleep
