I just checked the specifications for these headsets and they both have Dynamic
microphones, according to the online literature. The CM500 is $60 and the
SB40 is $30 and the only differences are that the SB40 does not include the
bias battery pack required by some rig, but the Elecraft K3 does not require it
and the SB40 does not have the foam protector over the mic element. Other than
that, they are exactly the same. I will do some over the air tests
someday.Allen N5XZ Sent from my Verizon, Samsung Galaxy smartphone
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