A wireless microphone puts the capsule close to the speaker and the receiver at the camera or phone, which is the single biggest improvement available to anyone recording video. Distance is what ruins audio, and a clip on transmitter removes it entirely regardless of where the camera is.

Most current systems are a matched pair: a small transmitter that clips to clothing and a receiver that plugs into a phone, camera or computer. They pair automatically out of the charging case, which makes them far quicker to deploy than a traditional radio microphone.

Audio quality on video is what viewers actually judge. Poor picture is forgiven, poor sound is switched off, so a wireless microphone typically improves a recording more than a camera upgrade at the same price.