The HDV17MIC is designed to improve your sound recording quality. It is designed to fit camcorders and SLR cameras and is easily installed. It has a builtin, high performance, supercardioid pickup with dualhead technology for long pickup distances approximately 12 feet, wide frequency responses, and high quality sound. Features. NCR Noise Reduction Technology. External 20dB Sensitivity Enhancement Switch to adapt to different sound intensity pickups. Low Power IndicatorSpecifications. Monomer Electrostatic Capacitor Head. Pointing Feature Super Heart Pointing. Frequency Response 50Hz16KHz. Sensitivity Enhancement 20dB 2dB. Sensitivity 45dB 3dB 0dB1V/Pa 1KHz. Equivalent Noise Level 24dB A. Maximum Sound Pressure Level 130dB THD1.5% 1KHz. Output Impedance 200O 30% 1KHz. Channel Mono. Voltage AAA 1.5V Alkaline battery. Power Consumption 5mA typical. Battery Life Approx. 60 hours with new battery. Weight 0.5 lbs