Shure SLX4 J3 572-596MHz Wireless Microphone Receiver Jewelry This is a side window

This is a side window from a late 70s trailer

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Shure SLX4 J3 572-596MHz Wireless Microphone Receiver Jewelry This is a side windowFor this wireless system component to work, please make sure your transmitter and receiver match in frequency range (style). Automatic Frequency Selection Automatic Transmitter Setup960. Note: When purchasing separate wireless components, please match their frequency bands to ensure proper system operation. Microprocessor controlled diversity RF presence LED5 segment audio meter Multi function, backlit LCD Low battery indicator. Furnished rack