Shure BLX188/MX53 Combo S8, Dual UHF Wireless System, With 2 x BLX 1 bodypacks, SM Series combo, 2 x MX153 earmic set, Up to 3 systems in parallel, Pilot tone, Microprocessor-controlled internal antenna diversity, QuickScan frequency selection to locate open frequencies, Condenser MX153 microphone capsule: 20 - 20,000 Hz, Directional characteristic: Omnidirectional, Plastic receiver, Integrated antennas, XLR and jack outputs, Audio status LED, Frequency range: S8 823 - 832 MHz