Motorola PMLN6530 Manual page 6

Digital Symbol
Figure 1: Digital Symbol Marking
Radios with this "Digital Symbol" are digital
capable radios and require the use of
accessories with the same "Digital Symbol".
These accessories with the "Digital Symbol"
have been optimized for digital audio Transmit
and Receive. Use of non-approved
accessories may result in degradation of
audio quality.
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