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. 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 of worship. Features: Over 120 dB of dynamic range: no transmitter gain adjustments needed. AES 256-bit encryption for secure transmission; Optional Shure SB900A lithium ion rechargeable battery reports remaining runtime in hours and minutes; External charging contacts for docked charging; Backlit LCD with easy to navigate menu and controls; Selectable display mode showing group/channel, frequency, or battery runtime; 4-Pin male mini connector (TA4M); Rugged metal construction; Detachable ¼ wave antenna; Frequency and power lockout. Frequency: 606-670 MHz