Panasonic WX-ST400 Operating Instructions Manual page 15

J Sensitivity setting switch [SENS L/H] (inside the battery cover)
Sets the sensitivity to audio from for the microphone unit (page 19).
[SENS L] : Low sensitivity (factory default)
[SENS H] : High sensitivity
K Unused
L Pairing button [REG] (inside the battery cover)
This button controls the pairing between the microphone and the receiver.
⿟ Pairing: While the power switch is set to ON, keep the [REG] button pressed for more
than two seconds to enter pairing mode (page 20).
⿟ Pairing confirmation :
Press the [REG] button once while the power switch is set to ON to enter
pairing confirmation mode (page 25). The pairing confirmation mode lasts
for five seconds on both the microphone and the receiver, after which both
will go back to their normal operation mode.
M Connector for configuration and maintenance [SET] (inside the battery cover)
Micro USB 2.0 type B connector to connect the product to the wireless receiver /
extension receiver.
Connects through a USB 2.0 cable (micro type B male to type A male; locally procured)
and a conversion cable (type A female to micro type B male; locally procured).
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