Featuring the legendary SM58 vocal microphone, the Shure GLXD2+/SM58 dual-band handheld transmitter delivers superior, transparent digital audio. GLX-D+ wireless systems combines the leading edge of Automatic Frequency Management technology with best-in-class intelligent lithium-ion battery rechargeability and dual-band (2.4GHz and 5.8GHz) wireless frequency capability. A lithium-ion rechargeable battery and swivel adapter are included for ease of operation.