Shure QLXD1 Wireless Bodypack Transmitter Frequency G50QLXD1 Wireless Bodypack Transmitter quickly syncs with a wireless receiver over IR at the push of a button and maintains a clear, uninterrupted signal over its entire range. Works with QLX D Digital Wireless Systems Featuring transparent 24 bit digital audio quality and incredibly efficient RF spectrum usage, the QLXD1 Wireless Bodypack Transmitter is ideal for wireless vocals and instruments in mid size presentation spaces, music venues, and houses