Thanks to patented Audio Reference Companding technology, exceptional transmitter linearity, and patented CueMode, the Shure PSM® 900 Wireless Personal Monitoring System meets the needs of professional audio applications, delivering excellent audio quality and superior performance. reliable RF performance. With twenty supported frequencies per band and a tuning bandwidth of 36 to 40 MHz, the PSM 900 system has the capacity to handle the most demanding environments, including intercom and in-ear monitoring applications.