Handheld wireless microphone transmitter. With an interchangeable SM58 microphone cartridge, the QLXD2/SM58 Handheld Wireless Microphone Transmitter is ideal for wireless vocals in presentation spaces, music venues, and houses of worship.The QLXD2/SM58 Handheld Wireless Microphone Transmitter works with QLX-D Digital Wireless Systems. Features: 24-Bit digital audio quality; Incredibly efficient RF spectrum usage; Quick syncing with a wireless receiver over IR at the push of a button; Clear, uninterrupted signal over the entire operating range AES 256-bit encryption for secure transmission; Over 120 dB of dynamic range: no transmitter gain adjustment needed; 1, 10 mW selectable RF output power; 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; Rugged metal construction; Frequency and power lockout. Frequency: 606-670 MHz