The wireless version of Shure’s popular SM58 dynamic microphone (see our entry on this classic mic for more details), this set comprises a hand-held transmitter, an SM58 microphone head, and a wireless receiver so that you can get on with giving your best performance without worrying about nuisance wires. The GLXD2 transmitter features a handy LCD screen and pairs up with the GLXD4 receiver *to change* using two AA batteries to provide up to 8 hours performance. This easy to set up system offers great audio quality.