Motorola PMLN6536 Mode D'emploi page 9

Digital Symbol
Figure 2: 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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