Sennheiser ew 100 ENG G3 Wireless Microphone System - A (516-558 MHz) with LyxPro Studio headphone, Frequency A Kit Includes Sennheiser EK 100 G3 Receiver, SKP 100 G3 Plug-On Transmitter, SK 100 G3 Bodypack Transmitter, ME 2 lavalier microphone and LyxPro Studio Headphone SKP 100 G3 Plug-On Transmitter transforms XLR equipped devices (such as microphones and mixing consoles) into wireless devices by simply plugging the unit in UHF Transmission, pre-configured with 20 banks 12 preset channels each, 1680 Tunable Frequencies Across 42 MHz Pro-Grade Closed Back Over-Ear Headphone for Live Monitoring & Mixing See Product Description for more details