Ban Xia held a small green PCB board in her hand, examining it under the light. It was slightly larger than her thumb, with a dozen centimeters of wire hanging beneath it, a thin white wire, each end soldered with a similarly sized square circuit board. The board in Ban Xia's hand was marked with a blurry "TX", while the other end was marked "RX". This device was to be plugged into a relay station, connecting a transmitter at one end and a receiver at the other, linking two base stations together.
The PCB board was coated with green solder mask, beneath which you could see neatly arranged wiring. The circuit board was small and simple, arranged with neat rows of silver elongated solder pads, denoted with white English abbreviations.
"Hmm...MIC AUDIO…"
Ban Xia inspected closely.
"PTT."
"GND."
"RX AUDIO."
"COR OUT."
She didn't understand what these abbreviations meant, but she could guess they indicated the functions of the pins.
