Zeck d.a.i.sy DS 800 UHF Manuel D'utilisation page 29

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3.3 Channel selector switch (8)
This rotary switch is used to select one of the 16 available UHF
channels for the transmission between transmitter and receiver.
The switch must be operated with the adjustment screwdriver
that is included with the set. The 16 channels are numbered
from '0' to 'F'. The actual frequencies for each selected channel
are listed in the 'Technical specifications' chapter.
The receiver is equipped with the same type of switch (23). A
wireless transmission is only possible when both transmitter and receiver are
working with identical carrier frequencies. This is provided when both channel
s e l e c t o r switches (23) and (8) are set to the same position.
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