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Amazon.com: MicrocKing Wireless Microphone System, UHF 8-Channels Cordless Mic Set with Metal Handheld Mics, Rugged Metal Build, 300ft, Ideal for Karaoke/Party/DJ/Wedding/Speech/Outdoor Events(MK-280) : Musical Instruments
Wi-Fi Channels, Frequency Bands & Bandwidth » Electronics Notes
Amazon.com: Wireless Microphone System, Phenyx Pro Metal Wireless Mic Set with Handheld Microphone/Bodypack/Headset/Lapel Mics, 2 x 30 UHF Frequencies, Cordless Mic for Singing, Karaoke, Church, DJ (PTU-52B) : Musical Instruments
Office Depot
Sony URX-P40 Camera-Mount Wireless Receiver (UC14: 470 to 542 MHz)
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Sennheiser EW-D ME2 SET Wireless Lavalier Mic System, R1-6: 520 to 576 MHz Kit | eBay