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AD2/B58A - Handheld Wireless Microphone Transmitter - Shure USA
Amazon.com: Pyle UHF Receiver System, Wireless Bluetooth Microphone Includes 2 USB 1200mAh Rechargeable Battery Handheld Microphones, Ideal for for Home Karaoke, Classroom, Office and Business Applications : Musical Instruments
Sennheiser SKM 6000 Digital Handheld Wireless Microphone Transmitter (A1-A4: 470 to 558 MHz)