The traditional signal transmission through the connector is “circuit board→connector→flexible pcb board→connector→circuit board”, while the signal transmission of the rigid-flex PCB board is reduced to “rigid circuit board→flexible pcb board→rigid circuit board”, signal transmission distance between different media is shortened, and the problem of signal transmission attenuation between different media is also reduced. Generally, the circuit on the PCB board is made of copper, while the contact terminal of the connector is gold-plated, and the solder pin is fully tin-plated. Moreover, solder paste is required to be soldered on the circuit board, and the signal transmission between different media will inevitably be attenuated. If you switch to a rigid-flex PCB board, these media will become less, and the signal transmission ability can be relatively improved. For some products that require higher signal accuracy, it helps to improve their reliability.