MIPRO - ACT-707HE (6B) - Cardioid Condenser Handheld Transmitter Microphone (Freq Set 6B) LED displays power on/off and battery fuel gauge Unique dual steel microphone head-grille design eliminates pop & wind noises Patented modularized capsule design provides extremely low handling-noise feature that other brands cannot compete. 22 hour battery life per single 9V battery