Rollei Pro Transmitter Mark II Instructions Manual page 33

Functions
5. Channel: The transmitter can be set for up to 16 radio channels from
the number 00 ~ 15 . Briefly press the channel key "CH" until the channel
number is highlighted . Then you can set the channel number by turning the
control dial .
Option menu: You can access the options
menu by pressing function keys 2 and 3
simultaneously for approx . 2 seconds . There
you can make further settings . Press the
control dial to select functions and settings,
and turn the control dial to scroll through the
menu . Press function key 3 under "OK" to
exit the options menu .
Options
Back light MID
Sleep(min) 10
ID number 99
Reset
Flash
33
OK