Rollei Pro Transmitter Instructions Manual page 33

Operation
Note: The flash lights that are using the same channel can be adjusted
separately in different groups regarding their mode and power output .
4. Press the test button to make sure that the flash lights will sync with the
transmitter .
5 . Press the mode button to set different modes (M/TTL) .
6 . Press the sync button to switch between the different sync modes: front
curtain sync, rear curtain sync and high speed sync .
7 . Press the modeling lamp button to activate or deactivate the modeling lamp
of the flash.
8. Press the sleep button to let the flash enter the sleep mode.
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