Sennheiser EW 500 Manual page 71

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Inserting and changing the battery
Unscrew the display section
Slide back the display section
becomes fully accessible.
Insert the 9 V PP3 battery (IEC 6 LR 61). Please observe correct polarity
when inserting the battery.
Push the the battery compartment into the radiomicrophone's body.
Screw the display section tight.
To change the battery, press out the battery from below (press in the
direction of the arrow).
Switching the transmitter on/off
Turn the protective cap
that the ON/OFF button becomes accessible.
Press the ON/OFF button
LED lights up.
To switch the transmitter off, press the
appears on the display. You can then release the button. The red LED
goes off.
Muting the transmitter
Use the MUTE switch to noiselessly mute the transmitter's audio signal (this
switch does not switch off the transmitter).
by turning it counter-clockwise.
until the battery compartment
at the bottom of the radiomicrophone so
to switch the transmitter on. The red
ON/OFF button until "OFF"