Shure BLX288/Beta58 Combo Q25, Dual UHF Wireless-System with 2 handheld transmitters Shure Beta58, Beta Vocal Series, Up to 6 systems simultaneously, Pilot tone, Microprocessor driven antenna-diversity, Quick-Scan function open frequency detection, Dynamic Beta58 microphone capsule: 50 - 16.000 Hz , cardioid, Plastic receiver, Integrated antennas, XLR- and jack outputs, Audio status-LEDs, Frequency range: Q25 (742 - 766 MHz)