PNI PMR R17 Mode D'emploi page 12

Compander
Turn on to compress the microphone sound.
Scramble
To change or mix the communication voice and
information, so that people can only receive and
understand it through a specific frequency or channel.
It is important to ensure that the content of radio waves
will not leak privacy and prevent eavesdropping.
Special Subsonic
After opening, special encryption prevents other
people's walkie-talkies from matching our walkie-talkies.
Retain
Intelligently choose which mode is correct when pairing
with other people's radios.
Retain and Special DATA
Every radio comes with an original code from the
English 12 User manual