Av-jefe Tcm141-35 Lavalier (Lapel) Mic 3.5mm Lock Screw for Sennheiser Wireless Microphone Element: Electret Condenser Pattern: Omnidirectional Frequency Response: 30 - 18,000 Hz Operating Voltage : 1V - 10V DC Package Includes: Windscreen, Tie Clip, 3.5mm Connector