Sennheiser's EW 500 G4 is a flexible radio mic system, designed for professional users. It features upto 88MHz of tuning bandwidth and operation of upto 32 x simultaneous channels. An Ethernet socket on the rear panel allows use of Sennheiser's Wireless Systems Manager (WSM) control software for remote monitoring and setup using a PC or Mac. The receivers feature a clear OLED display. G4 is backwards compatible with G3 and G2 products.