Mini FM Transmitter Microphone Module MIC Wireless Audio Transmitter 100MHz Mini Bug Wiretap Dictagraph Interceptor - AliExpress
Shure AD2/K8B Handheld Microphone Transmitter (470-616 MHZ) — AV Now Fitness Sound
Amazon.com: Pyle Dual Channel Wireless Microphone System - Portable VHF Audio Mic Set with Clip Lavalier lapel, Handheld, Headset, Transmitter, ¼'' cable, power adapter - For Karaoke, PA DJ - Pyle Pro
JAYETE UHF Microphone Wireless System, Professional Wired to Wireless Microphone Converter Micphone Transmitter and Receiver for Dynamic Microphone Condenser Microphone - Walmart.com