Plug-on transmitters are a special design that attaches directly to the XLR connector of a typical handheld microphone, effectively adapting it to wireless operation. Plug-on transmitters can also be used to adapt boom mics and other equipment with XLR connectors. They operate on 9 volt alkaline or lithium batteries and provide a wide input adjustment range and phantom power options to accommodate the wide variety of microphone types. This design offers maximum flexibility for entertainers or speakers not wanting to be tethered to a microphone stand or podium, or for ENG or EFP situations, or by roving talk show hosts, because it allows for maximum mobility and control.