Telematrix 3300TRM - Manual (Page 13)

SWITCH SETTING
Flash Switch
There is a 3-position slide switch located on
the handset under the plastic cover. Use a sharp pointer
to remove the switch plastic cover plate to expose the
switch.
The FLASH KEY can provide a 100ms/300ms and
600ms time line break. After setting switch, hang up
and then remove handset from it’s cradle to activate
new switch position.
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