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The BTECH GMRS-V2 does not feature any form of individual calling.
Using these features does NOT mean that others won't be able to listen in on your
transmissions.
They only provide a method to filter out unwanted incoming transmissions. Any
communications made while using these features will still be heard by anyone not
employing filtering options of their own.
You can change the CTCSS or DCS settings while in memory (MR) mode.
CTCSS, DCS, and Tone-burst are also popular to open up repeaters.