UR4D+ Wireless Receiver Includes two Beta58 Handheld microphones and two UR1 beltpack transmitters with WL184 cardiod elements. 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.