Reflecta Combo Album-Scanner Manual Del Usuario página 49

Brightness adjustment: the exposure of the scanner is set
automatically. On some occasions you need to adjust the
brightness (exposure) of your subject.
Press the EV/delete button to adjust exposure value.
Press the up or down button to adjust the exposure
compensation between +2EV to -2EV in 0.5 increments.
The amount of compensation is shown at the bottom of
the LCD screen. Press the EV/delete button again to
complete the setting.