HF-90 Operation & Installation Guide
The following illustration shows the operating controls
which are on the DTMF microphone/handset, supplied with
the Advanced Model HF-90. Section 6 of this Guide gives
detailed instruction on how to use each of these controls.
Section 4.2
DTMF microphone/handset controls
15
Press to talk (PTT) switch
STAR key
Numeric keys
HASH key
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