Amazon.com: 5.8GHz FPV VTX PIT/250/500/1000/2000mW Long Range Switchable Transmitter Support OSD Configuration Using Smart Audio and Microphone with MMCX, FC Uart for Racing Drone RC Drones Quadcopter RC Car : Toys &
Expansion Microphone Set for Polycom SoundStation VTX 1000/IP 6000 - 323.tv
Listening to Motor Sound During Flight | Microphone for FPV Quadcopter - Oscar Liang
AKK 5.8GHz PIT/200mW/400mW/800mW/1000mW Switchable VTX FPV Transmitter Long Range Version with Smart Audio and Microphone for FPV Racing Drone RC Cars Quadcopter - Newegg.com
FrSky Scout VS600 VTX Black with the built-in microphone