Franklin BES-1870 - Manual (Page 9)

Serial Port: Plug in a serial cable here to connect the unit to
your PC.
AC Adaptor Jack: The AC/DC adaptor is in the 9 volt range
within a current range of 200 to 300 milli-amperes.
This symbol indicates that the inner core of the plug of an
AC adaptor is negative and that the outer part of the plug is
positive. If the symbol on your AC/DC adaptor does not
match the above symbol, confirm its compatibility at its place
of purchase.
Book Card Slot: The card slot is located on the back of the
unit. It enables you to read electronic books purchased from
franklin.com and is compatible with most BOOKMAN and
BMC cards.
Battery Compartment: The battery compartment is located
on the back of the unit. It holds two AAA batteries.
8
Book
Card
Slot
Battery
Compartment
AC
Adaptor
Jack
Serial
Port
Headphone
Jack
Volume
Control