Sennheiser EW 572 G3 - Wireless Instrument System with Bodypack Transmitter and CI1 Instrument Cable. A-Range (516-558 MHz) SK500 G3 body pack transmitter, Ci1 instrument cable and EM500 G3 rack-mountable diversity receiver with GA3 rack mount kit. A-Range (516-558 MHz) 42 MHz bandwidth: 1680 tunable UHF frequencies for interference-free reception Enhanced frequency bank system with up to 32 compatible frequencies Ethernet port for connecting to the Wireless Systems Manager (WSM) software for control via computer - this delivers a good overview of monitoring and professional data management for multi-channel systems Sturdy metal housing with illuminated graphic display