Wireless microphones send sound through thin air rather than a wire when compared with a wired microphone setup. Wireless microphones convert the sound into radio-frequency energy and send it from the transmitter to the receiver. The microphone receiver converts the signal back into audio and routes it into a mixer. A wireless microphone setup consists of three main components which are a microphone, a transmitter, and a receiver.
Why do you need to buy a good wireless microphone?
Better Sound - Crystal Clear Audio
More reliable - Rugged construction
Designed for live performance and studio recording
Built-in features like noise-free bandwidth diversity