Audio Technica M2 Wireless Monitoring System 

The Audio-Technica M2 is designed to give pro-sumer performers a professional sounding in-ear system. It offers Personal Mix Control allowing musicians to independently control their mix and volume from the stage. Get a couple extra body-pack receivers, and your whole band can listen in from a single transmitter. With 100 frequencies to choose from, you should be free from interference as well.

The M3 steps things up a notch with true professional grade features. There are 1,321 selectable frequencies, giving the Verizon guy another chance to exercise his famous line. The M2 allowed only for ten systems to be used in unison where the M3 ups that capability to sixteen.