Shure BLX1288/MX53 Combo T11, Dual UHF Wireless-System, With BLX1 pocket transmission, SM58 handheld transmitter and MX153 ear-set microphone, Up to 3 systems simultaneously, Pilot tone, Microprocessor driven antenna-diversity, Quick-Scan function for free frequency detection, Condenser MX153 microphone capsule, Dynamic SM58 handheld transmitter: 20 - 20,000 Hz, ball cap, Plastic receiver: 50 - 15,000 Hz, cardioid, Integrated antennas, XLR- and jack outputs, Audio status-leds, Frequency range: T11 (863 - 865 MHz)