The BLX Vocal Wireless System from Shure joins world-class design and construction with simple and easy setup and operation, featuring QuickScan frequency selection and the industry-standard SM58 vocal microphone capsule for warm, clear vocal reproduction. Legendary sound and performance, right out of the box. Included: BLX4 wireless receiver; BLX2/SM58 handheld transmitter with integrated SM58 cardioid dynamic microphone capsule; microphone clip; padded zipper case.