Alto Radius 100 Professional UHF Diversity Wireless Microphone System (520 - 937.5MHz) All-in-one, easy-to-use wireless microphone system for professional vocal application Dual-antenna UHF diversity receiver for increased reliability and signal consistency 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