This system has a clip-on mic or plug-on transmitter to make your XLR mic wireless.
The Sennheiser ew 100 ENG Plug-On Wireless System offers flexibility for electronic news gatherers who need quality, portable recording indoors or out. Its SKP 100 G3 plug-on transmitter transforms XLR equipped devices (such as microphones and mixing consoles) into wireless devices simply by plugging the unit in. The bodypack transmitter, as well as the plug on can be synced to the receiver with the simple push of a button. Sennheiser complete the ew 100 ENG Plug-On Wireless System with a very small high-quality directional clip-on microphone.