Sennheiser 2015 - Manual (Page 22)

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Displaying the frequency
You can display the frequency stored in the selected channel. If you operate
your system on one of the channels with a freely selectable frequency
(channel bank “U”), this feature is very important as it allows you to check
if the transmitter and the receiver are set to the same frequency.
̈ Press the SET button ᕧ and keep it pressed.
̈ Press the ̆ button (UP) ᕨ . The current frequency is displayed.
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