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5. Power Sources
There are three ways to power the ALVA BC640 or ALVA BC680:
Using the USB power;
Using the internal battery;
Using the external power adapter
In the subsequent sections, you will find more information about each power option.
5.1. USB power
If you connect your ALVA BC640 or ALVA BC680 directly to a PC using the USB
connection, the PC will provide power to the Braille display through the USB cable.
The USB connection provides sufficient power to charge the base unit's internal
battery and to operate the ALVA Braille Controller Base Unit. If you are using an
ALVA BC680, please make sure to connect it to the left USB port (marked with one
dot) as the internal battery can only be charged by using this USB port.
5.2 Internal battery
The ALVA BC640 and ALVA BC680 run on an internal battery if no external power is
plugged in or no USB connection is used. The ALVA BC640 will approximately run up
to 15 hours on a fully charged battery and the ALVA BC680 will run approximately 10
hours on a fully charged battery. Typically, the internal battery is used in case of a
wireless Bluetooth® connection.
5.3 External power adapter
An external power adapter is provided with the ALVA BC640 or ALVA BC680
package. As soon as the external power adapter is connected to the Braille
Controller, the battery will be charged and the ALVA Braille Controller will draw its
power from this adapter. Charging an empty battery will take approximately 4 hours.
The external power can be used in combination with wireless Bluetooth® technology
or the USB connection.
Warning! Do not use another external power adapter than the one supplied in
the ALVA BC640 or ALVA BC680 package.
Page 23
ALVA BC6
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