Radio Shack 21-1904 Owner's Manual page 18

After Direct Call transmission is
completed, the radio (transmitter and
receiver) will change its CTCSS code
setting to Private code for 15 seconds.
The Private code is used to avoid
interruption from the original Channel
and CTCSS code. In the 15-second
period, both radios can only transmit
and receive voice messages at the
original Channel with Private Code.
Also, the ID icon on both radios flashes
on the display to indicate this 15-
second period. When conversation is
made within this period, the 15-second
time- out is extended for another 15
seconds. To exit the 15-second period,
press or wait for the 15-second
CALL
time-out.
After a 15-second time out, both radios
are restored to their original settings
and the display reverts back to the
display without Direct Call function.
On the other hand, if you do not press
any key on the receiver after a Direct
Call is received, the radio's display
continues showing the received ID
MISS ID
number and (Missed ID) flashes
until you press any key (except ).
FUNC
Also, the radio generates a beep to
remind you that there is an incoming
call and it continues beeping once
18