Alto Radius 200 Professional UHF Diversity Wireless Microphone System (520&ndash;937.5 MHz) All-in-one, easy-to-use wireless microphone system for the most demanding professional vocal applications Dual-antenna/dual-receiver True Diversity design for mission-critical, dropout-free operation UHF band operation: 520 - 937.5MHz Receiver includes a high-visibility back-lit LCD display: Displays RF frequency and channel, AF and RF signal levels and other critical functions Single-button scan feature for quickly identifying the optimal operating frequency