Shure P9T PSM 900 Q15, Wireless In Ear Transmitter, Frequency range Q15 750 - 790 MHz, Improved scan and sync mode to search free frequencies and infrared transmission, Audio reference companding for clear honest in ear sound, Robust metal chassis, Audio-Frequency range: 35 - 15,000 Hz, 20 Compatible frequencies per band, Switchable transmitter power 10/50mw, Display with name, frequency, channel, transmit power, Adjustable 3.5 mm headphone output, Sync switch, RF mute, Automatic RF level limiter, 9.5"" case, Dimensions: 197 x 166 x 42 mm, Weight: 850 g, Including rack mount and power adapter