The Shure BLX288/SM58 Wireless Dual Vocal System combines professional-quality sound with simple setup and up to 14 hours battery life for legendary audio performance for two vocalists right out of the box. The system includes BLX88 tabletop dual-channel receiver, 2 legendary SM58 handheld transmitters, 2 microphone clips, power supply, 2 AA batteries, and user guide.