Shure PGXD24/SM58-X8 Digital Handheld Wireless System with SM58 Vocal Microphone The PGXD24/SM58 Handheld Wireless System is part of the Handheld wireless systems family. PGX Digital Wireless, with state-of-the-art, 24-bit digital audio and trusted Shure microphones, delivers stunning sound and a strong, clean RF signal. PGXD4 receiver, PGXD2/SM58 handheld transmitter, clip, power supply, 2 AA batteries, carrying case, and user guide. PGXD2 transmitter features automatic setup,a multi-function LED Indicator,and provides you with 8 hours of continuous use on 2 AA batteries. The PGXD4 receiver offers 24-bit/48kHz accurate sound, offers technology for incredibly accurate sound, The SM58 mic is legendary for its uncanny ability to withstand abuse that would destroy other microphones. The SM58 mic is world-renowned for its distinctive upper-midrange presence peak that ensures an intelligible, lively sound. Perfectly fits a performer's hand, balanced for total comfort during long gigs. It gives you and your microphone a generous 200' (60m) operating range without losing audio quality. Frequency response is a smooth, vocal-tailored 50Hz-15kHz, and the price is a bargain considering its life expectancy. The SM58 has not only helped to define the sound of rock vocals on stage, it's also been used to build stages and later flawlessly performed with. Auto frequency selection, and greater reliability thanks to its true digital diversity.