Shure SLX2/B58 Wireless Microphone Transmiter Handheld SLX2/Beta58 Product Description SLX Wireless Systems feature a wide variety of industry-standard handheld vocal microphones. Options include the Beta 87A or C, Beta 58A, SM86, and the legendary SM58. SLX Wireless Systems feature Shures patented Audio Reference Companding for crystal-clear sound beyond the limits of conventional wireless technology. Features •Frequency range: 518MHz-542MHz •Automatic Transmitter Setup •Backlit LCD with timeout feature •Frequency and power lockout •3-segment battery fuel gauge •2 AA batteries (included) provide 8 hours of continuous use