True diversity Dual UHF wireless receiver UR1's and UR2's sold separately J5 578 - 638MHz L3 638 - 698 Mhz UR4D Wireless Receivers 2400 Selectable Frequencies Across 60 MHz Bandwidth Track Tuning Filtering Technology Up to 60 Preset Compatible Systems/Band (140 w/Multiple Bands, Region Dependent) Networked Automatic Frequency Selection Automatic Transmitter Setup (including Custom Group Upload) Flash Memory to Store Six 60-channel Custom Frequency Groups Shure Patented Audio Reference Companding Multi-function Bit-mapped Backlit LCD Built-in USB & Ethernet Network Compatibility Shure Wireless Workbench Control/Monitoring Software Remoteable Antennas Shure Microprocessor-controlled Diversity