The Shure GLX-D14R+ dual-band wireless rack system features the premium MX153 headset for high-quality vocal performance applications and the GLXD4R+ half-rack receiver. The GLX-D14R+ wireless system combines 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. This wireless system includes a GLXD1+ bodypack transmitter, a GLXD4R+ rackmountable wireless receiver, an SB904 lithium-ion rechargeable battery, a MX153 earset headworn microphone and all the accessories you'll need.