Product Description"S" designates for single side-band users
Internal tone generator and speaker
Includes 3' plug in speaker lead for tone generation in to mic
Momentary toggle allows for single side-band reading without voice
Allows Ham/Amateur users to accurately measure frequency in 1.8 MHz to 50 MHz range
For any radio without hard-wiring
Measures RF signal or TX channel to ant.
Level from .1 to 1V Max.
Has Input/Output Type SO-239 connectors
DOSY Professional Architecture
Printed Circuit Board
Blue LED color
For AC/DC Power Supply add "P" to P/N
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Very accurate and works just as advertised, I am impressed!