Connects professional microphones to the Canon's existing 3.5 mm mini jack Maximize Canon's on-board audio performance ETS, long a leader in baluns for computer networks, applies that expertise in Balanced Line technology to the DSLR Audio Camera Balun, featuring an XLR-style connector shell containing balun transformer technology.The PA911 Audio Camera Balun from ETS is designed to easily connect the Canon 5D or 7D DSLR camera audio port to a professional-grade microphone.This device preserves the balanced line, allowing full noise reduction for lengths up to 2000 ft of microphone cable.NOTE- Although the PA911 Audio Camera Balun alone does not support phantom-powered microphones, typical condenser microphones with separate power supplies or self-powered with batteries are fully compatible.