Franklin Deutsch/English Professor PRO BDS-1860 - Manual (Page 8)

6
Using the Special Features
Your unit is equipped with several special features that many, but
not all, BOOKMAN book cards use. To learn if you can use the
special features with a particular book card, read its User’s Guide.
Speaker
Speaker: The speaker is
located on the front of your unit.
For best results, do not cover
the speaker with your hand.
Contrast: The dial on the side
of the unit under the serial port
enables you to dim or lighten
the screen. Headphone Jack: The
headphone jack is designed for
3.5 mm, 35 ohm impedance
stereo headphones. Caution:
Monophonic headphones will
not work with this unit.
Headphone Jack
Contrast