Featuring the industry-standard BETA 87A vocal microphone, the half-rack GLXD24+/B87A dual-band vocal system from Shure delivers superior, transparent digital audio. GLX-D+ rackmountable digital wireless systems combine Automatic Frequency Management technology and dual-band (2.4GHz and 5.8GHz) wireless operation with a rackmountable metal receiver, rechargeable lithium-ion batteries and unparalleled design. GLX-D+ Frequency Managers (available separately) connect multiple GLXD4R+ receiver systems for increased channel count and improved RF reliability, consolidating RF to one pair of antennas. This system includes the GLXD2+ handheld transmitter with BETA 87A microphone, a GLXD4R+ rackmountable wireless receiver, an SB904 lithium-ion rechargeable battery and all the accessories you'll need.