Audio transmission system for transporting a signal over long distances
Wireless Audio Transmission Set – Receiver and Transmitter Set for Electric Guitars and Bass Guitars – Tree Monkey Music
Microphone Wireless System Audio Transmission Systems Universal 30m-50m Pickup | eBay
Amazon.com: Sondery Wireless Guitar Transmitter Receiver System 5.8Ghz 1/4 inch or 6.35mm Audio Transmission 4 Channels, USB C Type 5V Li Battery Charging : Musical Instruments