https://auctions.josephfinn.com/auctions/39/lot/32848-shure-ur4s-wireless-microphone-receiver-w-audio-reference-companding-h4-518-578-mhz
Shure UR4S Wireless Microphone Receiver w/ Audio Reference Companding (H4: 518 - 578 MHz) - Joseph...
Shure UR4S Wireless Microphone Receiver w/ Audio Reference Companding (H4: 518 - 578 MHz)