Shure P3RA Professional Bodypack Receiver for PSM300 Stereo Personal Monitor System, G20 For this wireless system component to work, please make sure your transmitter and receiver match in frequency range (style) P3RA offers an upgrade to P3R, with all-metal housing, optional recharge ability, and advanced features including EQ and volume limiting Works with PSM300 Stereo Personal Monitor System Delivers up to 6 hours of continuous operation with 2 AA batteries Offers extended runtime with the Shure SB900 lithium-ion battery, which can charge in the body pack Includes P3RA, 2 AA batteries, battery adapter kit, zipper bag, and user guide