Beyerdynamic S 900 Operating Instructions Manual page 37

AF input, 4-pin mini XLR for microphones (lavalier, neckworn mics). For
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connection please refer to chapter 2.5 "AF Connection".
ON/OFF switch
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(ON = switch to "ON" position; OFF = switch to "OFF" position).
Switch off the transmitter when not in use.
Transmitting antenna
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LC-Display
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Infrared receiving diode for ACT function.
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Gain control to adjust input gain.
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GT/MT switch: When you use electric guitars this switch must be
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in the "GT" position.
In the GT mode the gain control is deactivated. Switch to the
"MT" position when you use condenser and wired microphones.
In the MT mode the gain control is activated.
Battery compartment and cover for two 1.5 V batteries (AA).
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Removable belt clip can be rotated 360°. To remove use a
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screwdriver at a 45° angle.
This is how to remove the belt clip
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