Technical Pro WM77 Wireless Instrument Microphone, Black Cardiod dynamic wireless microphone Frequency response: 100Hz-10kHz - Service area: 33 feet Built in digital processor with processing &gt;850sd - directivity: uni-directional - operating voltage: 1.5V DC 10 Foot XLR to 1/4 Inch (6.35mm) cable and case included Sensitivity: -72dB 3dB - impedance: 600 ohms