Shure P9T-H21 Wireless Transmitter for PSM 900 In-Ear Personal Monitoring System (H21: 542 to 578 MHz)The P9T from Shure is a compact wireless transmitter that can be used in conjunction with a P9R bodypack receiver as part of a PSM 900 wireless personal monitoring system. The transmitter's half rack design makes it easy to transport, and it can be installed in any standard equipment rack. The transmitter features patent pending Cue Mode technology to send multiple mixes or channels to a receiver, and a Scan and Sync function to quickly sync with a