Motorola DTR550 Digital On Site Radio
... One to Many Calling allows you to public
group call all other DTR sereis radios
on the same group ID and channel similar to analog radios
. Or call and talk privately with a ... :
Group calling Allows users to access up to 20 public
and 10 private groups.
Digital one-to-many call Allows other DTR radios
on same group ID and channel to communicate.
SMS ... Details...