Shure QLXD2 / KSM8B

Handheld Wireless Microphone Transmitter with Interchangeable KSM8 Capsule cardioid.
Frequency band G51 (470 - 534 MHz).
Frequency Response: 40Hz-16kHz
Up to 72 MHz switching bandwidth
22 compatible channels in an 8 MHz TV band
120 dB dynamic range
One-touch sync function for easy set up
Selectable display mode shows group/channel, frequency, or battery runtime.