Camera Accessories
TAKSTAR SGC-598 Photography Interview Shotgun MIC Microphone for Nikon Canon DSLR Camera (Need 3.5mm Interface) Auxiliary
Low power indicator Transducer Principle: Back Electret Condenser Directivity Characteristic: Cardioid Powered by 1.5V AA alkaline battery Sensitivity: -32dB+/-3dB(0dB=1V/Pa at 1kHz)
https://www.bizrate.co.uk/cameraaccessories/takstar-sgc-598-photography-interview-shotgun-oid31015427999.html