AKG HC644 Head-Worn MicrophoneBuilding upon the success of AKG's C544 and C555, the AKG HC644 MD Head Worn Microphone is well suited for a variety of applications such as corporate speaking, educational presentations, or aerobics. The improved design utilizes a smaller capsule with higher sensitivity, solid RF shielding, and is sweat resistant. The head worn mic is well protected against interference caused by the inundation of wireless systems in the low to mid price range that