Uniden UH7750NB Owner's Manual page 7

Controls/Connectors
Standard Microphone
16
15
17
30
21
31
Controls and Connectors
15 CALL - Call Tone Button
16 INST - Instant Channel Button
17 PTT - Push To Talk Button
21 MICROPHONE
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7
UNIDEN UH7740NB UH7750NB UHF CB Transceiver