The Shure BLX14R/W85 Wireless Rack-mount Presenter System combines professional-quality sound with simple setup and and up to 14 hours battery life for legendary audio performance right out of the box. The system includes BLX4R half-rack single-channel receiver, WL185 lavalier microphone with BLX1 bodypack transmitter, lavalier clip, power supply, 2 AA batteries, windscreens, rackmount kit, 2 1/4 wave antennas, and user guide.