Panasonic WX-ST400 Operating Instructions Manual page 26

Confirming pairing
4
Check the [REG] indicator on the receiver
While the microphone is in pairing confirmation mode, the [REG] indicator of the paired
channel on the wireless receiver / extension receiver will turn green and orange
alternately. This allows to confirm the pairing. The pairing confirmation mode lasts for
five seconds, after which the devices will go back to their normal operation mode. Press
the [REG] button once during pairing confirmation mode to go back to the normal
operation mode.
Important
⿟ If the [PWR] indicator on the microphone blinks red, the microphone is not
paired to a wireless receiver / extension receiver. Perform the steps
described in "Pairing" (page 20).
⿟ The pairing confirmation can also be performed from the wireless receiver /
extension receiver.
⿟ The microphone audio will be kept on transmitting during pairing
confirmation.
⿟ Also refer to the wireless receiver / extension receiver manual.
26
Register indicator
* This illustration shows the WX-SR202P.