Pro Headset Head-mounted Headworn Microphone JK MIC-J 060 for Sennheiser Wireless - 35mm Screw Locking Plug - Omidirectional Mic Sweat and Dust-Proof Made Primarily for Indoor and Outdoor Activities Gooseneck Microphone Boom of JK MIC-J 069 Yields Maximum Flexibility Professional Vocal Pickup, Pristine Audio Quality, Omni-directional Condenser Microphone 1/8 Inch (35mm) Locking Screw Plug Compatible With Sennheiser Evolution Series, G2, G3, EWD1, SK D1 / Line 6 X2 Digital Wireless Microphone System Designed for Broadcasters, TV Presenters, Lecturers, Musicians, Actors, Singers, and Any Other Applications Requiring Minimum Microphone Visibility with Maximum Comfortability Sweat and Dust-Proof Made Primarily for Indoor and Outdoor Activities Professional Vocal Pickup, Pristine Audio Quality, Omni-directional Condenser Microphone 1/8 Inch (35mm) Locking Screw Plug Compatible With Sennheiser Evolution Series, G2, G3, EWD1, SK D1 / Line 6 X2 Digital Wireless Microphone System Designed for Broadcasters, TV Presenters, Lecturers, Musicians, Actors, Singers, Performers and Any Applications Requiring Minimum Microphone Visibility with Hands-free Operation Polar pattern: Omni-directional Mic diameter: 4.0*1.5mm Sensitivity: - 43db2db SNR: &gt;58db Wire: 1.1m 2pcs of foams Frequency Range: 20-20KHZ Output Impedance: 2200ohms Standard Operation Voltage: 2.0V-10V.DC