Shure QLXD2/SM58 Wireless Handheld Transmitter (H50 Band - 534-598 MHz)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. Features: Works with QLX D Wireless Systems Offers up to 9 hours of continuous use with 2 AA alkaline batteries or up to 10 hours of continuous use with Shure lithium ion rechargeable batteries Includes QLXD2 SM58, 2 AA batteries, battery contact cover,