Designed for performers who are tired of the limits of floor wedges, the Shure PSM 400 Wireless Performance Pack offers hands-on control and freedom to musicians who have a limited budget for gear. At its heart is the P4M Personal Monitor Mixer--a 4-channel, 2-bus stereo mic/line mixer designed to optimize in-ear monitoring. It allows easy access to and control over each input source. 2 auxiliary inputs can be used to add channels from other sources. Includes the P4M Personal Monitor Mixer, P4T Wireless Transmitter with audio limiter and removable/combinable antennas, P4R Wireless Bodypack Receiver, and E3 earphones.