Austrian Audio OC707 WL1, Microphone Capsule For Wireless Systems, Directional characteristic: Cardioid, Frequency range: 35 - 20,000 Hz, Sensitivity: 3.6 mV/Pa, Self-noise: 26 dB SPL (A), Max. SPL: 152 dB, Replacement capsule for Shure, Sony and Lectrosonics handheld transmitters