The Shure UHF U4D-UA Dual-Channel Wireless Microphone Receiver is a professional-grade, frequency-agile diversity receiver for high-end audio applications in live sound and fixed installations. Housed in a single rack space, it contains two independent receiver sections, each with its own audio and RF meters, gain control, and output. The receiver operates in the UA frequency band (782-806 MHz), uses Shure's MARCAD diversity circuitry to prevent signal dropouts, and has a built-in tone key squelch circuit to eliminate unwanted noise bursts. It provides both balanced XLR and unbalanced 1/4" outputs for flexible connectivity and offers network capabilities for computer control and monitoring.