Telematrix 3302TRM - Manual (Page 13)

SWITCH SETTINGS
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 100ms/300ms and
600ms time line break. After setting the switch, hang
up and then remove the handset from it’s cradle to
activate new switch position.
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