A wireless microphone is composed of a portable transmitter (which can be installed in a pocket with an output power of approximately 0.01W) and a centralized receiver. Each portable transmitter has a different operating frequency, and the centralized receiver can simultaneously receive voice signals of different operating frequencies from each portable transmitter. It is suitable for occasions such as stage and podium. Before purchasing a wireless microphone, it is necessary to first understand the transmission frequency of the local television station and stagger the selection. If it is a new construction site, high-density wire mesh or iron sheet should be added to the top and surrounding areas of the building during civil engineering if conditions permit, to shield and isolate the interference of external wireless signals. Alternatively, the SQUEICH knob on the receiver can be used to suppress interference signals (but this has an impact on the receiving distance of the microphone). Sensitivity is the ratio of the output voltage of a microphone to the input sound pressure under unit sound pressure excitation, expressed in mV/Pa. To be consistent with the measurement of the level in the circuit, sensitivity can also be expressed in decibels
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