between pressing the CH button for each handset
Setting your Phone
In standby mode, press the SEL button once, then the LCD will show PROGRAM to indicate you have entered the setting mode.
LCD CONTRAST SETTING [SEL 2]
Press the SEL button, then the 2 key, the current level CONTRAST ADJ X[X=1,2,3,4] will show on the LCD. Press the 
or 
button to get the desired level and press the SEL button once more to confirm and exit.
SETTING THE RINGER [SEL 3]
Press the SEL button, then the 3 key, the current mode RING ON/OFF will show on the LCD. Press the 
or 
button to activate/deactivate the ringer function. Press the SEL button once more to confirm and
exit. You should hear a confirmation beep.
SETTING THE DATE AND TIME [SEL 4]
Press the SEL button, then the 4 key, the SET TIME will show on the
LCD and the month with flash. Press the 
or 
button to get the desired month then press the SEL button to confirm and enter the next
item (the sequence is
the correct date and time, press SEL button to confirm. You should hear a confirmation beep.
SETTING THE KEYPAD TONE ON OR OFF [SEL 5]
Press the SEL button, then the 5 key. Press the 
or 
to select Beep
On or Beep Off then press the SEL button to confirm.
AUTO AMPLIFY SETTING
Auto Amplify ON
To set handset amplifier so that it will AUTOMATICALLY return to your previous volume setting every time you use the handset without having to press the “AMPLIFY” button.
Simply turn the “AUTO AMPLIFY” switch in the battery compartment to the ON (up) position using the tip of a pencil. When the “AUTO AMPLIFY” switch is in the ON position, you do not need to press the “AMPLIFY” button on the side of the handset. On any call, you can temporarily turn OFF and turn back ON the AUTO AMPLIFY feature by pressing the “AMPLIFY” button. When the LED indicator light is on the AMPLIFY feature is engaged.