Optelec
ALVA USB 640 Comfort
Page 4
English
2.1.2. Right side layout
The power switch is located on the right side of the ALVA USB 640 Comfort. The
ALVA USB 640 Comfort is switched on when the rectangular push-button is pressed.
Upon switching it on, the ALVA USB 640 Comfort will generate an audio signal.
2.1.3. Left side layout
The left side of the ALVA USB 640 Comfort features two connectors. From front to
back, you will find a mini USB connector and a feature connector. The feature
connector has no function with the release of this manual.
2.1.4. Front panel keys, eTouch navigation buttons and cursor routing
keys
The names of the ALVA USB 640 Comfort keys listed in this section will be used
throughout all of the documentation, including the screen reader documentation. This
section will present the name of the keys, and describe their main function as
supported by the screen reader. Their precise function is defined by the screen
reader. Please refer to your screen reader documentation for detailed key function
definitions.
eTouch keys
The two keys found on each side of the Braille line are called eTouch keys. They are
used for panning left and right, and also for various other Braille functions.
eTouch 1
Top left key marked with two vertical lines
eTouch 2
Bottom left key marked with one horizontal line
eTouch 3
Top right key marked with two vertical lines
eTouch 4
Bottom right key marked with one horizontal line
Cursor routing keys
Each cursor routing key corresponds to the Braille cell located immediately above it.
These keys are typically used for routing the cursor or caret to the corresponding
Braille cell, generating a left or right mouse click at that point, or for obtaining
additional information about the content of the Braille cell.
Thumb keys
At the front of the ALVA USB 640 Comfort, you will find five front panel keys known
as thumb keys. These include four large keys symmetrically aligned along the front of
the ALVA USB 640 Comfort, and one smaller button located in the centre. Pressing
the four large thumb keys will allow you to navigate left, right, up or down
respectively. Pressing the key in the middle will allow you to return to the cursor
position.
