The SLX24/ SM58 system comes with the SLX4 diversty receiver, SLX2 transmitter and the SM58 microphone cartridge. SLX Wireless Systems feature Shure' s patented Audio Reference Companding for crystal-clear sound beyond the limits of conventional wireless technology. Backlit
LCD with timeout feature Frequency and power lockout 3-segment battery fuel gauge 2 AA batteries ( included) provide 8 hours of continuous use 518 - 782 mHz operating range SM58 The legendary Shure vocal mic is tuned to accentuate the warmth and clarity of lead and back-up vocals. Consistently the first choice of performers around the globe. The Shure SM58® is a unidirectional ( cardioid) dynamic vocal microphone designed for professional vocal use in live performance, sound reinforcement, and studio recording. A highly effective, built-in, spherical filter minimizes wind and breath " pop " noise. A cardioid pickup pattern isolates the main sound source while minimizing unwanted background noise.