The Shure P3TRA215CL PSM300 Wireless In-Ear Monitor System provides great sound and a simple setup for entry-level users. Stereo Personal Monitor Systems deliver reliable wireless freedom to every corner of the stage. Patented Audio Reference Companding ensures the clearest sound with ultra-low noise and no artifacts. Easy to set up and operate, PSM 300 systems offer one-touch frequency scan and sync to find and assign a clean wireless channel. Adjust the volume and use MixMode technology or stereo mode to create a personal mix from two channels of audio.