Microphone
From Amazon
Headset Microphone for QTX And Adastra Portable PA Units | Select Correct Frequency VHF 174.1MHz
Inta Audio
QTX Headset Microphone + Beltpack for QRPA & QXPA (174.1MHz)
CommsAndSound
Qtx Qhs-174.1 Headset For Qr+qxpa - 174.1mhz