Radius 100M is an easy-to-use UHF diversity instrument wireless system that provides crystal-clear sound for professional applications. Alto’s switching diversity receiver design utilizes two separate antenna systems for uncompromised wireless performance. If one antenna experiences signal interruption, the receiver instantly switches to the second antenna. This assures you of an extremely stable, reliable wireless signal,with virtually no chance of dropout or interruption. This is the promise of wireless performance-delivered!