The Shure BLX288/B58 Wireless Dual Vocal System combines professional-quality sound with simple setup and 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 BETA58A handheld transmitters, 2 microphone clips, power supply, 2 AA batteries, and user guide.