Pyle pro-Headset (PMEMSH15), Screw Lock 3.5mm, Black Wired Boom - Element: Back Electret Condenser - Polar Pattern: Cardioid - Power Supply: External DC 1.5V-9V Power Supply For Sennheiser Wireless System - Frequency Response: 50Hz-16kHz - S/N Ratio: &gt;70dB - Sensitivity: -45dB ( +/- 3dB) - Output Impedance: 2.2KO ( +/- 30%) Wired Boom - Element: Back Electret Condenser - Polar Pattern: Cardioid -^Power Supply: External DC 1.5V-9V Power Supply For Sennheiser Wireless System -^Frequency Response: 50Hz-16kHz - S/N Ratio: &gt;70dB - Sensitivity: -45dB (3dB) - Output Impedance: 2.2KO (30%)^Maximum SPL: 130dB - Cable Length: 4ft. -^Connector: Sennheiser Screw Lock 1/8" (3.5mm) Plug - Accessories Included: Windscreen - Dimension: 9.9mm