Hensel Certo 400 Monolight - Manual (Page 42)

Operating the device
42
Activating and deactivating the radio remote trigger and photo cell
To activate the radio remote trigger and photo cell, proceed as follows:

Press the SYNC button 3 times.
The LED display next to the SYNC button lights up orange. The radio
receiver and photo cell are activated.
 Now select the desired channel 1–16 on the RF CH switch with the
provided tool.
 Ensure that this channel is also set on the transmitter.
To deactivate the radio receiver and photo cell, proceed as follows:

Press the SYNC button once.
The LED display next to the SYNC button goes out. The radio remote trigger
and photo cell are deactivated.