Shure P3RA Wireless Bodypack Receiver for PSM300 System (H20: 518-542 MHz)Key Features For PSM300 Personal Monitoring Systems Rugged All Metal Construction Volume Limiter 2 Band Shelving EQ with High Low Boost MixMode for Two Independent Mix Levels 2 x AA Batteries Provide 6 Hours Runtime Frequency Scan and IR Sync High Contrast LCD Screen Shure P3RA H20 Overview The P3RA Wireless Bodypack Receiver from Shure is a compact, stereo wireless receiver designed to be used with a Shure P3T transmitter, as part of the PSR 300