The Shure GLX-D14R+ rackmountable digital wireless system combines Automatic Frequency Management technology and dual-band (2.4 and 5.8 GHz) wireless operation with a rack-mountable metal receiver, rechargeable lithium-ion batteries and unparalleled design. GLX-D+ Frequency Managers (available separately) allow you to connect multiple GLXD4R+ receiver systems for increased channel count and improved RF reliability, consolidating RF to one pair of antennas. Setting a new standard for ease of operation and digital audio clarity, this wireless system includes a GLXD1+ bodypack transmitter, a GLXD4R+ rackmountable wireless receiver, SB904 lithium-ion battery and all the accessories you'll need.