Polar Pattern Is A Compact, Entry-Level Wireless Lavalier Microphone System Offering An Easy-To-Use, Cost-Effective, And All-Inclusive Solution For Recording One Subject To Your IOS Mobile Device. The System Delivers Improved Sound Quality Over The Built-In Mics On Cameras And Mobile Devices To Supply Clear, Intelligible Speech For, Super-Clear Recording Sound. Frequency Response: 45Hz-18kHz And Sensitivity Is Font:-32+/-3dB(0dB=1V/Pa,At 1KHz) Rear:-44+/-3dB(0dB=1V/Pa,At 1KHz).