Sennheiser G4-A Instruction Manual page 66

Using the EK IEM G4
▷ Hold the infrared interface of the EK IEM G4 receiver in front of the in-
frared interface of an SR IEM G4 transmitter to transfer the scan re-
sults from the receiver to this transmitter.
The selected transmitter becomes the master transmitter.
The display panels of the other transmitters will display the message
Assign New Frequency?.
Receivers with non-compatible frequency ranges will not display a
message.
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