Shure BLX24R/SM58 Handheld Wireless System with SM58 Vocal Microphone, Rack Mount, J10 Includes: (1) BLX4R 1/2 Rack, Single Channel Wireless Receiver, (1) Rack Mount Kit, (1) BLX2/SM58 Handheld Transmitter with SM58 Microphone, (1) Mic Clip, (2) 1/4 Wave Antennas, (1) Zippered Transmitter Bag, (1) PS23US Power Supply and (2) AA Batteries Up to 12 compatible systems per frequency band (region dependent) Microprocessor-controlled internal antenna diversity One-touch QuickScan frequency selection quickly locates the best frequency 1/4" and XLR audio outputs Rack mount kit included. Removable antennas allow for quick antenna distribution. Up to 12 compatible systems per frequency band (region dependent), One-touch QuickScan frequency selection quickly locates the best frequency, and Microprocessor-controlled internal antenna diversity. XLR and &#034; output connectors. Adjustable output level. LCD display with detailed RF and audio metering. Two-color audio status indicator LED.