The Shure BLX14/CVL Wireless Presenter System combines professional-quality sound with simple setup and and up to 14 hours battery life for great audio performance right out of the box. The system includes BLX4 tabletop single-channel receiver, CVL lavalier microphone with BLX1 bodypack transmitter, lavalier clip, power supply, 2 AA batteries, windscreens, and user guide.