Shure BLX14R/W85 Wireless Presenter Rack Mount System with WL185 Lavalier Microphone, K12 Includes: (1) BLX4R 1/2 Rack, Single Channel Wireless Receiver, (1) Rack Mount Kit, (1) BLX1 Bodypack Transmitter, (1) WL185 Lavalier Microphone, (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 Quick and easy receiver frequency matching, easily accessible On / Off switch TQG connection for use with Shure lavalier, headset, earset and instrument mics and guitar cables Up to 14 hours of continuous use with 2 AA batteries (included), plus power and battery status LED 300 ft (100 m) operating range (line of sight) 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.