PSM300 Wireless bodypack receiver, P3R lets you use MixMode to customize the mono blend from two channels of audio, or select stereo mode and adjust the left / right balance as desired. Works with PSM300 Stereo Personal Monitor System Offers up to 6 hours of continuous operation with 2 AA batteries Includes P3R, 2 AA batteries, zipper bag, and user guide With its slim, lightweight, durable design, the P3R offers reliable wireless freedom that covers every corner of the stage, with up to 300 feet (90 meters) of range. Simply connect a set of earphones and adjust the controls to create a wireless personal mix. Patented Audio Reference Companding and 24-bit digital audio clarity ensure the clearest sound, with ultra-low noise and no artifacts.