Panasonic KX-TD500 User Manual page 24

2.1 Before Operating the Telephones
Using a Jog Dial
The Jog Dial can be used for the display contrast and the volume control or you can search for desired
items on the display. Rotate the Jog Dial in the either direction as desired. The contrast or the volume
level and the items will change as follows:
Left
(counter-clockwise)
Level decreases
To the previous item
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Right
(clockwise)
Level increases
To the next item
Operation