Comica Cardioid directional microphone includes selectable 10 dB gain boost and selectable high pass filter Frequency response 70-16000 Hz Includes foam and fuzzy (dead cat) wind screens; Clever shock mount integrated with the shoe mount Requires 2-AAA batteries; battery life = 200 hrs Features: Super – Cardioid Polar Pattern Low noise design Special Shock Mount Design Includes Foam Wind-screen and Wind-muff Cold-shoe mount with 1/4x20 Thread at the Bottom Specification: Transducer: Back Electric Condenser Polar Pattern: Super Cardioid Frequency Range: 70~16000HZ Max. SPL: 120dB THD::1% Dynamic Range: 110 dB Sensitivity: -28dB±3 dB / -38dB±3 dB Signal to Noise Ratio: ≥58 dB The 10 dB gain boost is helpful to improve distance to subject. The high cut filter is used to remove rumble and other low-frequency sounds.