AT&T E1828B - Manual (Page 17)

14
Telephone operation
Base settings
Choose base ringer volume
The base ringer volume can be set to OFF, LOW,
or HI, by adjusting the switch on the left side of
the telephone base. This switch affects only the
telephone base ringer volume, the handset ringer
volume remains unchanged.
Contrast adjustment (telephone base only)
There are four levels of contrast on the screen of
the telephone base which can be adjusted to suit
different viewing angles for both desktop use or
wall mounting. Press CONTRAST on the telephone
base to adjust the contrast on the screen.