SoulBay Mini USB Microphone, Clip-on Omnidirectional Condenser Microphone for Gopro Hero 4 and Hero 3 - [Plug and Play] Maximum Output: 120 mV Dynamic Range: 120 dB typical. Plug & Play design, convenient to use. Greatly increased sensitivity and signal-to-noise compared to built-in mic. Polar Pattern: Omnidirectional. Frequency Range: 30Hz ~ 18kHz Output Impedance: 2.2k Ohm Typical Signal to Noise Ratio: 74 dB Sensitivity: -30 dB +/-3dB / 0dB = 1V/Pa, 1kHz Includes: Alligator lapel clip, Microphone Cable with GoPro mini USB connector, Carrying pouch, windshield.