Shure P9RA+-H21 Wireless Bodypack Receiver For PSM 900 In-Ear Personal Monitoring System (H21: 542 to 578 MHz)The P9RA+ Wireless Bodypack Receiver from Shure is an updated version of the P9RA low profile, diversity stereo bodypack receiver for the PSM 900 wireless personal monitor system (sold separately). The receiver has a slim and compact extruded aluminum construction for easy placement on a performer. It offers improvements like more headroom, better stereo separation, and higher fidelity for robust RF performance and a cleaner, stronger signal with