Shure BLX14/MX53 T11, SM Presenter Series, UHF Wireless-System with BLX1 pocket transmitter and MX153 earset microphone, up to 3 Systems parallel, Pilottone, antenna-Diversity, Quick-Scan to find free frequencies, condenser earset MX153, 20 - 20.000 Hz, omni-directional, receiver with plastic housing, internal antennas, XLR- and Jack outputs, Audio Status-LEDs, frequencyrange T11 863 - 865 MHz