Frequency Band Version G20 Power Supply Included. Wireless transmitter housed in a rugged all-metal chassis for both entry-level and professional-tier PSM 300 systems.The P3T from Shure is a half-rack 24-bit digital audio wireless transmitter for the personal in ear monitoring system. It features audio reference companding to ensure transparent sound quality with no artifacts or dropouts. This rugged transmitter is built with easy front-panel controls, including the one-touch sync and input level knobs which are there to enable quick setup and easy operation. Furthermore, the rear-panel has balanced inputs and loop outputs that can provide versatile connectivity to other audio sources or other P3T units.