Sennheiser EM 300 G3 - Rackmountable True Diversity Wireless Receiver - A Range (516-558 MHz) 42 MHz bandwidth: 1680 tunable UHF frequencies for interference-free reception Enhanced frequency bank system with up to 24 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 True adaptive-diversity reception for high reception quality Sturdy metal housing with illuminated graphic display