TR503 Wireless Microphone Condenser Headset Megaphone Radio Mic FM 87-108Mhz for
TR503 product upgrade, has been replaced with Type-c charging interface. TR503 Wireless Microphone. 1 x TR503 Wireless microphone. FM Transmitter:The transmit frequency of this wireless microphone adjustable from 87MHZ to 108 MHZ.