Early challenges in emergency button adoption—such as weak trigger signal capture, electromagnetic interference (EMI), and poor anti-misoperation performance—have been overcome by specialized PCB assembly technologies, particularly rigid-flex PCBs and high-precision surface mount technology (SMT). These innovations effectively enhance the sensitivity of analog front-ends for capturing rapid trigger signals, while integrating EMI shielding layers to eliminate interference from external electronic devices and harsh environmental factors. Rigid-flex PCBs, in particular, balance compact form factors with reliable signal transmission, supporting the miniaturization of fixed and portable emergency button devices without compromising response speed. This technological leap has enabled emergency button PCB assemblies to outperform traditional emergency trigger circuits in key areas: