A wireless microphone is a microphone that transmits audio signals without the need for a physical cable connecting it to the sound system or recording device. Instead, wireless microphones use radio frequency (RF) signals or infrared signals to transmit the audio signal to a receiver unit, which is connected to the sound system or recording device.

Wireless microphones provide greater mobility and flexibility compared to wired microphones, allowing performers, presenters, and speakers to move freely without being restricted by cables. They are commonly used in live performances, conferences, sports events, and broadcasting where mobility is essential.

Wireless microphones come in various types, including handheld, lavalier (clip-on), and headset styles. They typically require batteries or rechargeable power sources to operate the transmitter unit, which sends the audio signal wirelessly to the receiver unit. Proper frequency management and interference avoidance are important considerations when using wireless microphones to ensure reliable and interference-free operation. Popular examples of wireless microphone systems include models from Shure, Sennheiser, and Audio-Technica.