Includes PGX2/SM58 Handheld Transmitter and PGX4 Diversity Receiver. Legendary live performance featuring superior clarity and warmth. Ideal for lead and backup vocals. The Shure PGX4 receiver makes wireless setup a snap. With features like Automatic Frequency Selection and Automatic Transmitter Setup, the PGX4 offers the best in wireless to performers on the go. The Legendary Shure SM58 vocal microphone is tuned to accentuate the warmth and clarity of lead and back-up vocals. Consistently the first choice of performers everywhere.